Add missing apps to INSTALLED_APPS

This commit add the following apps to the INSTALLED_APPS setting:
- django.contrib.staticfiles
- tastypie

static files requires STATIC_ROOT and STATIC_URL to be set in order to
be fully functional, and once in use we can use ./manage.py
collectstatic to collect all the static files in one place that is
usable by apache or nginx.

The apache conf will require something similar to this:

Alias /static/ureport/  /home/ureport/src/ureport/ureport_project/static/
Alias /static/contact/  /home/ureport/src/ureport/ureport_project/static/
Alias /static/generic/  /home/ureport/src/ureport/ureport_project/static/
Alias /static/poll/  /home/ureport/src/ureport/ureport_project/static/

Alias /static/  /home/ureport/src/ureport/ureport_project/static/
Alias /media/  /home/ureport/src/ureport/ureport_project/static/

Alias /static/media/ /home/ureport/src/ureport/ureport_project/static/admin