fix(datepicker): add type attribute for buttons

Author: bekos

template/datepicker/datepicker.html

@@ -1,9 +1,9 @@
 <table class="well well-large">
   <thead>
     <tr class="text-center">
-      <th><button class="btn pull-left" ng-click="move(-1)"><i class="icon-chevron-left"></i></button></th>
-      <th colspan="{{rows[0].length - 2 + showWeekNumbers}}"><button class="btn btn-block" ng-click="toggleMode()"><strong>{{title}}</strong></button></th>
-      <th><button class="btn pull-right" ng-click="move(1)"><i class="icon-chevron-right"></i></button></th>
+      <th><button type="button" class="btn pull-left" ng-click="move(-1)"><i class="icon-chevron-left"></i></button></th>
+      <th colspan="{{rows[0].length - 2 + showWeekNumbers}}"><button type="button" class="btn btn-block" ng-click="toggleMode()"><strong>{{title}}</strong></button></th>
+      <th><button type="button" class="btn pull-right" ng-click="move(1)"><i class="icon-chevron-right"></i></button></th>
     </tr>
     <tr class="text-center" ng-show="labels.length > 0">
       <th ng-show="showWeekNumbers">#</th>
@@ -14,7 +14,7 @@
     <tr ng-repeat="row in rows">
       <td ng-show="showWeekNumbers" class="text-center"><em>{{ getWeekNumber(row) }}</em></td>
       <td ng-repeat="dt in row" class="text-center">
-        <button style="width:100%;" class="btn" ng-class="{'btn-info': dt.isSelected}" ng-click="select(dt.date)" ng-disabled="dt.disabled"><span ng-class="{muted: ! dt.isCurrent}">{{dt.label}}</span></button>
+        <button type="button" style="width:100%;" class="btn" ng-class="{'btn-info': dt.isSelected}" ng-click="select(dt.date)" ng-disabled="dt.disabled"><span ng-class="{muted: ! dt.isCurrent}">{{dt.label}}</span></button>
       </td>
     </tr>
   </tbody>