feat(fabfile): add fabfile with basic operations
chore(docs): update docs, setup script
chore(ErrorPage): make 500 error page more informative
fix(template): fix form actions attribute in accounts template.

If the action is "empty" google chrome doesn't submit the form.
chore(docs): update docs for heroku deployment
feat(settings): update cache settings to use heroku-memecache

Breaking:
Replaces the earlier settings with the one which is compatible
with heroku.