Added Scopes to Contributions
So many scopes
added a bunch of working model methods. sorry no tests
Merge pull request #19 from abigezunt/add_scopes

model methods returning relevant info
added attendance to users table
adding more model methods
added controller logic (?) that returns the info requested to the front end, tentatively residing in the index method
Merge pull request #20 from abigezunt/add_attendance

added attendance to users table
Merge pull request #22 from abigezunt/working_on_controller

Users Controller Methods
Fixing merge conflicts.