title: ui.bootstrap directive always occurs multidir error
body: <p>I get this error when I try to use ui.bootstrap's directives like $modal and $datepicker.</p>
  
  <pre><code>Error: [$compile:multidir] Multiple directives [datepickerPopup, datepickerPopup]  asking for new/isolated scope on: &lt;input type="text" class="form-control" datepicker-popup="{{format}}" ng-model="dt" is-open="opened" min-date="minDate" max-date="'2015-06-22'" datepicker-options="dateOptions" date-disabled="disabled(date, mode)" ng-required="true" close-text="Close"&gt;
  http://errors.angularjs.org/1.2.19/$compile/multidir?p0=datepickerPopup&amp;p1=…ate%2C%20mode)%22%20ng-required%3D%22true%22%20close-text%3D%22Close%22%3E
  at VALIDITY_STATE_PROPERTY (http://172.21.101.123/user/lib/angular/angular.js:78:12)
  at assertNoDuplicate (http://172.21.101.123/user/lib/angular/angular.js:6889:15)
  at applyDirectivesToNode (http://172.21.101.123/user/lib/angular/angular.js:6281:13)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5976:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15)
  at compileNodes (http://172.21.101.123/user/lib/angular/angular.js:5988:15) 
  </code></pre>
  
  <p>And this is my code (html).</p>
  
  <pre><code>&lt;input type="text" class="form-control" datepicker-popup="{{format}}" ng-model="dt" is-open="opened" min-date="minDate" max-date="'2015-06-22'" datepicker-options="dateOptions" date-disabled="disabled(date, mode)" ng-required="true" close-text="Close" /&gt;
  &lt;span class="input-group-btn"&gt;
         &lt;button type="button" class="btn btn-default" ng-click="open($event)"&gt;&lt;i class="glyphicon glyphicon-calendar"&gt;&lt;/i&gt;&lt;/button&gt;
  &lt;/span&gt;
  </code></pre>
  
  <p>I didn't use same named('datepickerPopup') multiple directives in one tag.</p>