Field 'feature' added to Project model fixes #93

- Field feature was added to Project.
- Project manager adds two new method: 'get_feature_projects' and
  'get_feature_project'
- Fork me on github banner is not longer visible for small devices
Changed footer to a more 'simple' version refs #93

Footer all centered, three lines, lighter top border.
Deleted border-top from footer as spec in refs #93

Deleted the top margin from the footer.
Fixes #77 Email notification are sent for projects updates when

using the built-in change_status method. When manually changing
the status of of project notifications will not be sent. It was
designed this way so that notification are sent when
a change in status occurs by comparing new_status to instance
status. This could also be accomplished by overinding the save
method but a database query would need to be perform (to check
for the old status and compare to new one) each time an instance
is saved.
Fixes a bug in the change_status method for the Project model.

The instance was assign the new status from line 1. This impeached
the method to evaluate correctly.
Makes the number of users a required field.

Option 1 is selected by default.
Draft projects no longer show duplicate results. Fixes #101

ProjectManager's get_draft_for_user method was returning duplicates
results because of the or clause. A .distinct() filter is now applied
to the queryset before returning.
Adds fields biography and display_email to User model Fix #102

Users can decide whether or not they want their emails displayed
publicly or not. Also a biography field was added. This field does
not display html.
Removed author facet from search Fixes #100

Projects can not longer be faceted by author. This was
not longer needed since the new facet, "collaborators", was
added.
adding new tests for aggregator app
Merge remote-tracking branch 'origin/master' into fixes
Fix failing test for FeedItemManager.
Reviewed version of last commit.

- celery task, "send_email", was moved out of projects and packages and into
  a task.py file in the website module.
- create a new ticket to get rid of the is_active flag for the
  project model
- changed word 'revision' for 'review'
- included basic copy for notification emails
- added feature as admin editable.
Merge pull request #111 from rapidsms/fixes

Last big pull request I make