Add default CONVOS_REDIS_URL when started in production mode
Change /avatar resource to take ?host=:str&nick=:str&user=:str

  - Add /image/avatar-404.gif
  - Add /image/avatar-500.gif
Can't use an undefined value as an ARRAY reference
Merge pull request #60 from Nordaaker/feature/24-remote-avatar

Feature/24 remote avatar
Upped dependency
Merge branch 'master' of github.com:Nordaaker/convos