docs: initial overview docs for button - dialog

src/lib/button-toggle/OVERVIEW.md

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+Buttons toggles aregroups of buttons that can be toggled on and off. They can be configured to 
+behave as checkboxes or as radio buttons. Button toggles are always part of a 
+`md-button-toggle-group`.
+
+<!-- example(button-toggle-overview) -->
+
+### Exclusive selection vs. multiple selection
+By default, `md-button-toggle-group` acts like a radio-button group- only one item can be selected.
+In this mode, the `value` of the `md-radio-group` will reflect the value of the selected button and
+`ngModel` is supported. 
+
+Adding the `multiple` attribute allows multiple items to be selected (checkbox behavior). In this
+mode the values of the the toggles are not used, the `md-radio-group` does not have a value, and 
+`ngModel` is not supported.
+
+### Accessibility
+The button-toggles will present themselves as either checkboxes or radio-buttons based on the 
+presence of the `multiple` attribute. 
+
+### Orientation
+The button-toggles can be rendered in a vertical orientation by adding the `vertical` attribute.

src/lib/button/OVERVIEW.md

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+Angular Material buttons are native `<button>` or `<a>` elements enhanced with Material Design 
+styling and ink ripples.
+
+<!-- example(button-overview) -->
+
+Native `<button>` and `<a>` elements are always used in order to provide the most straightforward
+and accessible experience for users. A `<button>` element should be used whenever some _action_
+is performed. An `<a>` element should be used whenever the user will _navigate_ to another view.
+
+
+There are five button variants, each applied as an attribute:
+
+| Attribute          | Description                                                                 |
+|--------------------|-----------------------------------------------------------------------------|
+| `md-button`        | Rectangular button w/ no elevation.                                         |
+| `md-raised-button` | Rectangular button w/ elevation                                             |
+| `md-icon-button`   | Circular button with a transparent background, meant to contain an icon     |
+| `md-fab`           | Circular button w/ elevation, defaults to theme's accent color              |
+| `md-mini-fab`      | Same as `md-fab` but smaller                                                |
+
+
+### Theming
+Buttons can be colored in terms of the current theme using the `color` property to set the 
+background color to `primary`, `accent`, or `warn`. By default, only FABs are colored; the default
+background color for `md-button` and `md-raised-button` matches the theme's background color. 

src/lib/card/OVERVIEW.md

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+Cards are content containers for text, photos, and actions. Cards are intended to provide 
+information on a single subject.
+
+<!-- example(card-overview) -->
+
+
+### Basic card sections
+The most basic card needs only an `<md-card>` element with some content. However, Angular Material
+provides a number of preset sections that you can use inside of an `<md-card>`:
+
+
+| Element               | Description                                                              |
+|-----------------------|--------------------------------------------------------------------------|
+| `<md-card-title>`     | Card title                                                               |
+| `<md-card-subtitle>`  | Card subtitle                                                            |
+| `<md-card-content>`   | Primary card content. Intended for blocks of text                        |
+| `<img md-card-image>` | Card image. Stretches the image to the container width                   |
+| `<md-card-actions>`   | Container for buttons at the bottom of the card                          |
+| `<md-card-footer>`    | Section anchored to the bottom of the card                               |
+
+These elements primary serve as pre-styled content containers without any additional APIs. 
+However, the `align` property on `<md-card-actions>` can be used to position the actions at the 
+`'start'` or `'end` of the container.  
+
+
+### Card headers
+In addition to the aforementioned sections, `<md-card-header>` gives the ability to add a rich
+header to a card. This header can contain:
+
+| Element                | Description                                                             |
+|------------------------|-------------------------------------------------------------------------|
+| `<md-card-title>`      | A title within the header                                               |
+| `<md-card-subtitle>`   | A subtitle within the header                                            |
+| `<img md-card-avatar>` | An image used as an avatar within the header                            |
+
+
+### Title groups
+An `<md-title-group>` can be used to combine a title, subtitle, and image into a single section.
+This element can contain:
+* `<md-card-title>`
+* `<md-card-subtite>`
+* One of:
+    * `<img md-card-sm-image>`
+    * `<img md-card-md-image>`
+    * `<img md-card-lg-image>`

src/lib/checkbox/OVERVIEW.md

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+`<md-checkbox>` provides the same functionality as a native `<input type="checkbox">`
+enhanced Material Design styling and animations.
+
+<!-- example(checkbox-overview) -->
+
+### Checkbox label
+The checkbox label is provided as the content to the `<md-checkbox>` element. The label can be 
+positioned before or after the checkbox by setting the `labelPosition` property to `'before'` or
+`'after'`.
+
+If you don't want the label to appear next to the checkbox, you can use 
+[`aria-label`](https://www.w3.org/TR/wai-aria/states_and_properties#aria-label) or 
+[`aria-labelledby`](https://www.w3.org/TR/wai-aria/states_and_properties#aria-labelledby) to 
+specify an appropriate label.
+
+### Use with `@angular/forms`
+`<md-checkobx>` is compatible with `@angular/forms` and supports both `FormsModule` 
+and `ReactiveFormsModule`.
+
+### Indeterminate state
+`<md-checkbox>` supports an `indeterminate` state, similar to the native `<input type="checkbox">`.
+While the `indeterminate` property of the checkbox is true, it will render as indeterminate 
+regardless of the `checked` value. Any interaction with the checkbox by a user (i.e., clicking) will
+remove the indeterminate state.
+
+### Theming
+The color of a `<md-checkbox>` can be changed by using the `color` property. By default, checkboxes
+use the theme's accent color. This can be changed to `'primary'` or `'warn'`.  

src/lib/dialog/OVERVIEW.md

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+The `MdDialog` service can be used to open modal dialogs with Material Design styling and 
+animations.
+
+<!-- example(dialog-overview) -->
+
+A dialog is opened by calling the `open` method with a component to be loaded and an optional 
+config object. The `open` method will return an instance of `MdDialogRef`:
+
+```ts
+let dialogRef = dialog.open(UserProfileComponent, {
+  height: '400px',
+  width: '600px',
+});
+```
+
+The `MdDialogRef` provides a handle on the opened dialog. It can be used to close the dialog and to
+recieve notification when the dialog has been closed.
+```ts
+dialogRef.afterClosed.then(result => {
+  console.log(`Dialog result: ${result}`); // Pizza!
+});
+
+dialogRef.close('Pizza!');
+
+```
+
+Components created via `MdDialog` can _inject_ `MdDialogRef` and use it to close the dialog
+in which they are contained. When closing, an optional result value can be provided. This result
+value is forwarded as the result of the `afterClosed` promise. 
+
+### Dialog content
+Several directives are available to make it easier to structure your dialog content:
+
+| Name                  | Description                                                              |
+|-----------------------|--------------------------------------------------------------------------|
+| `md-dialog-title`     | \[Attr] Dialog title, applied to a heading element (e.g., `<h1>`, `<h2>`)|
+| `<md-dialog-content>` | Primary scrollable content of the dialog                                 |
+| `<md-dialog-actions>` | Container for action buttons at the bottom of the dialog                 |
+| `md-dialog-close`     | \[Attr] Added to a `<button>` to make the button close the on click      |

src/lib/dialog/README.md

@@ -8,7 +8,6 @@ MdDialog is a service, which opens dialogs components in the view.
 | ---- | ----------- |
 | `open(component: ComponentType<T>, config: MdDialogConfig): MdDialogRef<T>` | Creates and opens a dialog matching material spec. |
 | `closeAll(): void` | Closes all of the dialogs that are currently open. |
-| `closeTop(): void` | Closes the topmost of the open dialogs. |
 
 ### Config