Made boring staff table
added cohorts migration
added restful cohorts
Commit before migration testing
Added phases, week, and day to challenges.  Added Challenges to phases.  Models not updated
updated cohorts
added more cohort actions, but need to configure devise so we can create users/establish cohort_ids
Simple CSS conflict merged
Created staff column
Underlined link text in challenges#index
added create new cohort link to cohorts index
Fixed overflow issue on challenges#index, also fixed misplaced text-decoration tag
Fixed Schema Issue, added cohorts from james
Merge branch 'development' of https://github.com/supertopher/play_dough into development