IM-629

-show only single show at a time
IM-629

-add missing POST parameter
IM-629

-fix using instance id instead of show id
IM-629

-filter by using instance id instead of show id

Conflicts:
	airtime_mvc/application/models/Schedule.php
IM-629

-not using show_instnace_filter POST param correctly
IM-629

-fix minor SQL syntax error
Merge branch 'master' of dev.sourcefabric.org:airtime