add end_date to contests
fix endate datepicker
add locals
add tabs to contests index
short created_at in contests index
add scopes
fix views
mark up for contests index
Merge branch 'feature/add_end_date_to_contest' into develop

* feature/add_end_date_to_contest:
  mark up for contests index
  fix views
  add scopes
  short created_at in contests index
  add tabs to contests index
  add locals
  fix endate datepicker
  add end_date to contests