Don't show tables, if there's no data.
Open jobs by default (show_all flag) + change is_accepting to false if closed.

* Show open jobs by default and closed jobs when flag "show_all" is passed
* convert jobs to not accepting if status is changed to closed.
Close job should actually close the job + cleanup js comments
Changing created_at to formatted output
Don't show BRackets if supervisors not present (this will change)
Formatting tabs to spaces. nothing else.
Minor chnages to job flow update
Merge Todd's changes

* 'ga_jobs' of github.com:professor/whiteboard:
  Removing show for jobs
  Removing show for jobs
  Updating people in a collection now works
  .

Conflicts:
	app/models/job.rb
	app/views/jobs/show.html.erb