Adds :site option to GitHub strategy.
Adds :site option to GitHub strategy.

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