Docstring and pep8 category.py, entry.py, version.py
Update doc string for changes/model.
Add disqus to ballot.
Add django-disqus to REQUIREMENTS-dev.txt
Add disqus at entry-detail.
Move requirement to REQUIREMENTS.txt
Merge pull request #78 from ismailsunni/master

Docstring and pep8 category.py, entry.py, version.py