Changing UserRole to UserRoleJoin

Beware, this breaks the view for some reason
Renamed UserRoles to UserRole Joins, Needed ID column in user_role_joins table
Update Ability to get user roles, not role
Make it possible to limit roles by date
Use `self.table_name = ` instead of set_table_name to avoid deprecation warning
Store role_id as an integer instead of a string
Make the title of user roles tab
Give better names to columns, add last name col
Fix setting default log action
Merge pull request #15 from spacemunkay/denney-add-users-roles

Changing UserRole to UserRoleJoin