adding group model and creating association of it with user
able to save group along with user
setting user as admin if a new group is created
adding custom route for devise to allow an access token to be passwrd via url
when invite is sent, email includes link to registration with access token
able to delete extra email invite input fields
sign up view conditional upon a new user or joining group user
upon sign up, a user who is joining a group now becomes part of group associated with token
Merge branch 'development'