Group messages

changed flex-nav ui/ux; unified side-nav closing arrow; added flex-nav
footer with navigation options.

Improve message pre processing

changed og:image; fixed fontello icons; removed multi font; added
constellation animation

Better urls

Rocket packages

* master:
  Respond a transparent pixel if avatar doesn't exists. Fixes #149
  Sort usernames in room closes #151
  Remove unused code
  rename config file