feat(navBar): allow expression in type. <nav-bar type="{{myType}}">

Closes #599

Author: ajoslin

Diff for: js/ext/angular/src/directive/ionicViewState.js

@@ -65,9 +65,10 @@ angular.module('ionic.ui.viewState', ['ionic.service.view', 'ionic.service.gestu
       backButtonType: '@',
       backButtonLabel: '@',
       backButtonIcon: '@',
-      alignTitle: '@'
+      alignTitle: '@',
+      barType: '@type'
     },
-    template: '<header class="bar bar-header nav-bar invisible">' +
+    template: '<header class="bar bar-header nav-bar invisible {{barType}}">' +
         '<div class="buttons"> ' +
           '<button view-back class="back-button button hide" ng-if="enableBackButton"></button>' +
           '<button ng-click="button.tap($event)" ng-repeat="button in leftButtons" class="button no-animation {{button.type}}" bind-html-unsafe="button.content"></button>' +
@@ -92,8 +93,6 @@ angular.module('ionic.ui.viewState', ['ionic.service.view', 'ionic.service.gestu
         }
       }
 
-      if(tAttrs.type) tElement.addClass(tAttrs.type);
-
       return function link($scope, $element, $attr) {
         var canHaveBackButton = !(!tAttrs.backButtonType && !tAttrs.backButtonLabel && !tAttrs.backButtonIcon);
         $scope.enableBackButton = canHaveBackButton;