Added invitation received message upon creating a new invite. Moved the inviteAcceptedRedirect into the logic code. Added a TODO for further user notification upon creating a request. Patch by: Lennard de Rijk

Now invited users can create a new Host profile Before the invited user had to be a developer for this to work. Now, instead the default checkIsDeveloper check for the 'edit Host', a custom checkIsInvite check is used. Patch by: Sverre Rabbelier