fix(input): clear text input

* Added Type Button

To prevent the clear button to call submit function if ngSubmit is used.

* Clear Input Action.

Added a change value action to the clearTextInput function. It now actually clears input

ionic/components/input/input-base.ts

@@ -406,6 +406,7 @@ export class InputBase {
    */
   clearTextInput() {
     console.debug('Should clear input');
+    this._value = '';
   }
 
   /**

ionic/components/input/input.ts

@@ -67,7 +67,7 @@ import {Platform} from '../../platform/platform';
   template:
     '<input [type]="type" [(ngModel)]="_value" (blur)="inputBlurred($event)" (focus)="inputFocused($event)" [placeholder]="placeholder" class="text-input">' +
     '<input [type]="type" aria-hidden="true" next-input *ngIf="_useAssist">' +
-    '<button clear *ngIf="clearInput && value" class="text-input-clear-icon" (click)="clearTextInput()" (mousedown)="clearTextInput()"></button>' +
+    '<button clear *ngIf="clearInput && value" type="button" class="text-input-clear-icon" (click)="clearTextInput()" (mousedown)="clearTextInput()"></button>' +
     '<div (touchstart)="pointerStart($event)" (touchend)="pointerEnd($event)" (mousedown)="pointerStart($event)" (mouseup)="pointerEnd($event)" class="input-cover" tappable *ngIf="_useAssist"></div>',
   directives: [
     NgIf,