feat(ionTab): add class attribute to tab items

js/angular/directive/tab.js

@@ -64,6 +64,7 @@ function($rootScope, $animate, $ionicBind, $compile) {
         attrStr('icon-off', attr.iconOff) +
         attrStr('badge', attr.badge) +
         attrStr('badge-style', attr.badgeStyle) +
+        attrStr('class', attr.class) +
         '></ion-tab-nav>';
 
       //Remove the contents of the element so we can compile them later, if tab is selected

js/angular/directive/tabNav.js

@@ -6,7 +6,7 @@ IonicModule
     require: ['^ionTabs', '^ionTab'],
     template:
     '<a ng-class="{\'tab-item-active\': isTabActive(), \'has-badge\':badge}" ' +
-      ' class="tab-item">' +
+      ' class="tab-item {{class}}">' +
       '<span class="badge {{badgeStyle}}" ng-if="badge">{{badge}}</span>' +
       '<i class="icon {{getIconOn()}}" ng-if="getIconOn() && isTabActive()"></i>' +
       '<i class="icon {{getIconOff()}}" ng-if="getIconOff() && !isTabActive()"></i>' +
@@ -18,7 +18,8 @@ IonicModule
       iconOn: '@',
       iconOff: '@',
       badge: '=',
-      badgeStyle: '@'
+      badgeStyle: '@',
+      class: '@'
     },
     compile: function(element, attr, transclude) {
       return function link($scope, $element, $attrs, ctrls) {