Directive not supporting custom delimiters

[Xample]

The directive assume the delimiters to be '{{' and '}}'
I made a branch and opened a pull request
Here is the idea of the refactor:

angular.module("datePicker").run(["$templateCache","$interpolate", function($templateCache,$interpolate) {
  var startSym = $interpolate.startSymbol();
  var endSym = $interpolate.endSymbol();

  $templateCache.put("templates/datepicker.html",
  ...
    "        <th colspan=\"5\" class=\"switch\" ng-click=\"setView('month')\">"+startSym+"date|date:\"yyyy MMMM\""+endSym+"</th>\r"
...

[Xample]

Note that I did not compiled the minified version one…