Added bugtracker app

Mini Issue Tracker program. Originally taken from Paul Bissex's blog
post:
http://news.e-scribe.com/230 and snippet:
http://djangosnippets.org/snippets/28/
Currently copied and modified from
https://github.com/brunobord/django-mini-issue-tracker
Added bugtracker to apps and allowed hosts for *
Updated site_base.html to remove sidebar