feat(ionic): remove all delegates

BREAKING CHANGE: $ionicScrollDelegate, $ionicSlideBoxDelegate, and
$ionicSideMenuDelegate have been removed.

  - $ionicScrollDelegate has been changed to $ionicScrollController.
    Documentation:
    [ionContent](
    http://ajoslin.github.io/docs/api/directive/ionContent),
    [ionScroll](
    http://ajoslin.github.io/docs/api/directive/ionScroll)

    Change your code from this:

    ```html
    <ion-content ng-controller="MyCtrl">
      <button ng-click="scrollBottom()">Scroll to bottom!</button>
    </ion-content>
    ```
    ```js
    function MyCtrl($scope, $ionicScrollDelegate) {
      $scope.scrollBottom = function() {
        $ionicScrollDelegate.scrollBottom();
      };
    }
    ```

    To this:

    ```html
    <!-- optional attr controller-bind, see docs -->
    <ion-content ng-controller="MyCtrl">
      <button ng-click="scrollBottom()">Scroll to bottom!</button>
    </ion-content>
    ```
    ```js
    function MyCtrl($scope) {
      $scope.scrollBottom = function() {
        $scope.$ionicScrollController.scrollBottom();
      };
    }
    ```

  - $ionicSideMenuDelegate has been changed to
    $ionicSideMenusController. Documentation:
    [ionSideMenus](http://ajoslin.github.io/docs/api/directive/ionSideMenus)

    Change your code from this:

    ```html
    <ion-side-menus>
      <ion-side-menu side="left">Side Menu Left</ion-side-menu>
      <ion-pane ion-side-menu-content ng-controller="MyCtrl">
        <button ng-click="toggleLeftMenu()">
          Toggle Left Menu!
        </button>
      </ion-pane>
    </ion-side-menus>
    ```
    ```js
    function MyCtrl($scope, $ionicSideMenuDelegate) {
      $scope.toggleLeftMenu = function() {
        $ionicSideMenuDelegate.toggleLeft();
      };
    }
    ```

    To this:

    ```html
    <!-- optional attr controller-bind, see documentation -->
    <ion-side-menus>
      <ion-side-menu side="left">Side Menu Left</ion-side-menu>
      <ion-pane ion-side-menu-content ng-controller="MyCtrl">
        <button ng-click="toggleLeftMenu()">
          Toggle Left Menu!
        </button>
      </ion-pane>
    </ion-side-menus>
    ```
    ```js
    function MyCtrl($scope) {
      $scope.toggleLeftMenu = function() {
        $scope.$ionicSideMenuController.toggleLeft();
      };
    }
    ```

  - $ionicSlideBoxDelegate has been removed and upgraded to
    $ionicSlideBoxController. It had only one method that
    was unneeded.  [Documentation](
    http://ajoslin.github.io/docs/api/directive/ionSlideBox)