added employees/shiftable and dropshift
buttons for grab and drop shifts
added color to available shifts
added date format to drop grab shifts
cleanup shift.rb model and actions.rb
fixed colors on calendar to fit theme
Merge branch 'addshifts'

* addshifts:
  fixed colors on calendar to fit theme
  cleanup shift.rb model and actions.rb
  added date format to drop grab shifts
  added color to available shifts
  buttons for grab and drop shifts
  added employees/shiftable and dropshift