Add missing functionality to Add button

Current functionality, user had to hit enter to call the form submit and the plus button did nothing. Adds ng-click to element to allow for user to add items with the add button as well.

Author: msholly

src/app/views/partials/checkboxes.html

@@ -15,12 +15,12 @@ <h4 flex="82">{{vm.remaining()}} of {{vm.todos.length}} remaining</h4>
                 <label>Write some todo task here...</label>
                 <input ng-model="vm.todoText" name="taskText" required>
             </md-input-container>
-            <md-button class="md-fab md-wayrn md-mini">
+            <md-button class="md-fab md-wayrn md-mini" ng-click="vm.addTodo($event)">
                 <i class="material-icons">add</i>
             </md-button>
         </div>
         <md-button class="md-primary" ng-click="vm.archive($event)">
             Remove completed
         </md-button>
     </form>
-</md-content>
+</md-content>