Update oauth2 dependency to 0.5.0
Update oauth2 dependency to 0.5.0

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