current stable release breaks all ajax requests

Thanks for this module, love what you have done here @sudishth

However there are an issue fixed at this commit: http://cgit.drupalcode.org/date_range_formatter/commit/?id=0342b45a743ea...

This issue actually breaks the whole ajax responses site wide for formatters & everything else and unless you use dev version

I took sometime to actually figure out that the issue was simply <?php tag issue