fix(datepicker): date formatting when using angular 1.3 fixes angular-ui#2659

Closes angular-ui#3293
Closes angular-ui#3279
Closes angular-ui#2440
Closes angular-ui#2932
Closes angular-ui#3074
Closes angular-ui#2943
Closes angular-ui#2733

Fixes angular-ui#3047
Fixes angular-ui#2659
Fixes angular-ui#2681

Author: DaveWM

src/datepicker/datepicker.js

@@ -524,6 +524,10 @@ function ($compile, $parse, $document, $position, dateFilter, dateParser, datepi
       }
       ngModel.$parsers.unshift(parseDate);
 
+      ngModel.$formatters.push(function (value) {
+         return ngModel.$isEmpty(value) ? value : dateFilter(value, dateFormat);
+      });
+
       // Inner change
       scope.dateSelection = function(dt) {
         if (angular.isDefined(dt)) {
@@ -544,9 +548,9 @@ function ($compile, $parse, $document, $position, dateFilter, dateParser, datepi
         });
       });
 
-      // Outter change
+      // Outer change
       ngModel.$render = function() {
-        var date = ngModel.$viewValue ? dateFilter(ngModel.$viewValue, dateFormat) : '';
+        var date = ngModel.$viewValue ? dateFilter(parseDate(ngModel.$viewValue), dateFormat) : '';
         element.val(date);
         scope.date = parseDate( ngModel.$modelValue );
       };