fix(datepicker): memory leak fix for datepicker

Fixes #2658
Closes #2684

Author: Ankit Kumar

src/datepicker/datepicker.js

@@ -605,6 +605,9 @@ function ($compile, $parse, $document, $position, dateFilter, dateParser, datepi
       };
 
       var $popup = $compile(popupEl)(scope);
+      // Prevent jQuery cache memory leak (template is now redundant after linking)
+      popupEl.remove();
+
       if ( appendToBody ) {
         $document.find('body').append($popup);
       } else {