feat(date-picker): Basic date picker

[Frly]

Basic Date Picker Component

[jelbourn]

@Frly the first step on a large contribution like this is to chat with us on the relevant issue (#675). Before going down the road of implementation, we'd need to have a solid plan for everything I mentioned in #1746

For the datepicker specifically, there is a revision of the spec in the works. We don't want to build/maintain a picker before that revision is ready.

I encourage you to release your datepicker as a standalone package- I know there any many people that would like to use it!

[Frly]

@jelbourn The service overlay is working, I have not uploaded completely, it is missing:

• Support for accessibility
• Support for i18n (RTL)
• Unit tests

This date selector can select between two dates

[yuxin6052]

@Frly could you share you sourcecode of basic datepicker

[fxck]

@yuxin6052 this is a pull request... you can see all the code in the files changed tab https://github.com/angular/material2/pull/1903/files

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