Inital merge of updated fullcalendar code

Starting at hash a0c27fd143e3ca43b4ba31ce97af124290482f17 (1.6.1) from
the main fullcalendar project (arshaw/fullcalendar) merging branch of
the fork (hasanozgan/fullcalendar) at hash
ba4243635f0786d93b51ee5017eaa5f91ba62646