[issue-79] Strict check

Author: palsingh

src/js/angular-datepicker.js

@@ -114,7 +114,7 @@
             $scope.day = Number($filter('date')(date, 'dd')); //01-31 like
             $scope.year = Number($filter('date')(date, 'yyyy'));//2014 like
             $scope.setDaysInMonth($scope.monthNumber, $scope.year);
-            if ($scope.hideDefaultDate != 'true') {
+            if ($scope.hideDefaultDate !== 'true') {
               $scope.setInputValue();
             }
           }