Added Flickr OAuth provider.
Added Flickr OAuth provider.

github/omniauth,toyokazu/omniauth_shibboleth,dougal/omniauth,sideci-sample/sideci-sample-omniauth,fxposter/omniauth,likeberi/omniauth,thomasmillergb/Year2-ruby-software-hut,nbrustein/omniauth,omniauth/omniauth,yui-knk/omniauth,ngpestelos/omniauth,ayunav/omniauth,twalpole/omniauth,thomasmillergb/Year2-ruby-software-hut,poznyakandrey/omniauth,mihar/omniauth-timekiwi,intridea/omniauth