fix(calendar): date formatting when entered via keyboard

This PR aim to fix (or at least drastically reduce) the broken date format when it's typed through keyboard. It's a bit hacky, since it only reverse supposed days and month when the setting monthFirst is defined to true, but I think this little piece of code will cover 98% of cases.

Closes #829 #986

src/definitions/modules/calendar.js

@@ -1276,6 +1276,8 @@ $.fn.calendar.settings = {
       if (text.length === 0) {
         return null;
       }
+      // Reverse date and month in some cases
+      text = settings.monthFirst ? text : text.replace(/([0-9]+)[\/\-\.]([0-9]+)/,'$2/$1');
       var textDate = new Date(text);
       if(!isNaN(textDate.getDate())) {
         return textDate;