Added the invite model class, usertests for this and invitetests
Fixed some issues with the tests and with the models
Fixed a error in a test
Added basic views for the viewing of practical groups
Added the functionality to view the invite and to accept it. I also built in a check to see if a invitation has not already been sent
Fixed the usage of the if and else scala statements in the views
Added more data to the initial-data.yml
Added more functionality to the inviting. Accepting an invite will now put you in the appropriate group and will remove the old groups from the system
Added a pending check to most things, updated the views
Last batch of changes to the invite, should be able to accept, reject and withdraw invites
Deleted bad tests and fixed tests to work with initial data as test data
Fixed checkstyle errors and warnings. Also fixed the rejectInvite method
Fixed errors that occurred due to the rebase
Fixed some more errors due to rebasing. Also fixed some queries in invite model
Fixed the ...Invite methods to not be static and to apply to themselves
Fixed the checkinvites method to use less database queries, also fixed the naming of invite methods
Fixed the first batch of pull request comments, proper naming, white spaces
Forgot some white space comments
to use the fullname function
Fixed a test and fixed checkstyle errors