starting TDD for classroom route
Merge branch 'master' into classroom_routes
stopping point for thursday night route creation (classroom)

Matt and Danny have the classroom#index route started and redirecting anyone not logged in. This commit is a work in progress commit and should not be merged.
create join table for users_classrooms

Users have many classrooms, classrooms have many users.
Created a join table and used has_many through.
finished index test for displaying teachers' classrooms

Controller test for classroom#index is passing to show teachers classrooms.
This commit also includes spec/support/controller_macros.rb this file adds helpers to set current user while controller testing with rspeec.
Merge pull request #7 from whoisglover/classroom_routes

Classroom index test complete