Added loadingModal and pausedModal.
Disabled messaging after next_period is called.
Wrapped clearing of loading modal in timeout.
Prevented __set_period__ and __set_group__ from being queuable which was causing admin page refresh to reset subjects.
Merge pull request #14 from RedwoodAdmin/JeremyDev

Jeremy dev
Merge pull request #15 from RedwoodAdmin/master

Update 2.1.1 release from master.