invite model along with its associated models is working - all tests are green
partial integration tests are working - up until invite accept, still need to implement invite decline
partial integration tests are working - up until invite accept, still need to implement invite decline
#367 - invite is ready for styling:
@ishayyaari to style the invites you will need to update:

invites/new
invites/show
invites/index
invites/_form

in order to style the accept/decline buttons in the ul/li just define a invite_events css class (see views/invites/action_forms

you will also need to stile the 3 new notifications
* notification_mailer/new_invite_notification.html.erb
* notification_mailer/invite_accepted_notification.html.erb
* notification_mailer/invite_declined_notification.html.erb
Merge remote-tracking branch 'origin/master'