Remove progress bar as all ministerial orgs are on

**Don't merge till: 30 April 2013**

As we have completed the transition of all the 24 ministerial
departments we no longer need to tell people how many are
still left to join on every page.

- Remove the bar from the layout
- Remove the JavaScript which let users hide the bar
- Remove the styles for the bar
- Remove the helpers to display the number of orgs
- Remove the relevent tests for the bar and helpers
- Moved the total ministerial department count helper into home
  controller and set it as a instance variable so its obvious that it is
  only used for home actions, updated the relevent views to use it

https://www.pivotaltracker.com/story/show/48464711