Configure for Heroku

See also:

https://devcenter.heroku.com/articles/getting-started-with-django

* Added Procfile and requirements.txt
* Modified settings.py and wsgi.py
* Removed bcrypt and django-address from requirements.txt

* FIXME: not clear who needs cffi, but it won't build on heroku
  Removing it from dependencies for now
Configure for Heroku

See also:

https://devcenter.heroku.com/articles/getting-started-with-django

* Added Procfile and requirements.txt
* Modified settings.py and wsgi.py (order of imports matters!)
* Removed bcrypt and django-address from requirements.txt

* FIXME: not clear who needs cffi, but it won't build on heroku
  Removing it from dependencies for now
Merge branch 'master' of heroku.com:intense-temple-3729 into heroku

Conflicts:
	moclos/wsgi.py
Set logic for constraint expression fixed

* Logic can be made more efficient; current implementation uses
  (query)set logic to progressively filter results returned from
  the DB. We can turn this into a single SQL query that makes only
  one select call on the DB.

  The drawback to this is that the django app may no longer be
  DB agnostic. This may be an interesting SO question.

* todo: ApplicationEntry filter should be reimplemented.
* ConstraintExpression can specify a template on which to limit
  applications fetched from.