Bug Fix: User's name not appearing in comment.

Fixes a bug where the users name was not appearing in comments
that were generated by email.
Bug Fix: Redirect to single organization

Fixed a bug where the redirect after login to the proposals page if a user
was a member of only one organization only kicked in if "&next=/" was
passed in the url.
Bug Fix: Users could spoof replies to decisions

Prevents users being able to spoof replies against decisions
to which they do not belong by checking membership based on the
decision id.
Bug Fix: Long email subject lines.

Emails were being sent out with long subject lines, because the
subject contained the whole desciption of the feedback. Description is
now truncated.
Bug Fix: Multiple click submit.

Javascript used to disable feedback submit button to prevent
multiple submits.
Editor of feedback is named in feedback change email.
Render django.contrib.comments with urls and linebreaks.
Empty Decision list pages have status apropriate message.
Custom email body template added for notifications.
Form help text and colourisation.

"Create Organization" form now has help text and colourisation
to indicate form errors.
Created custom auth forms.

Added error_css_class and required_css_class as form
class variables to permit easy styling.
Fix for failing jenkins tests.

A couple of Jenkins tests fail because LOGIN_REDIRECT_URL pointed to
an unfurnished url, resulting in 404. Jenkins doesn't need a special
redirect, so inherit the one from settings.py.