fixes #26 datetime formats of datepicker and python datetime module same
fixes #27 added get_absolute_url methods to event and group
added cbv to event and group detail pages
update and create view changed to cbv, object permssion added via guardian
membership defined with M2M thorugh model, fixes #28 too
rsvp view working
changed membership model name
resolved pylint issues
Merge pull request #29 from agiliq/rsvp

Rsvp added, bug fixed and views changed to class-based views