Add Travis-style dependency status image [ci skip]
Add Travis-style dependency status image [ci skip]

omniauth/omniauth,thomasmillergb/Year2-ruby-software-hut,yui-knk/omniauth,poznyakandrey/omniauth,thomasmillergb/Year2-ruby-software-hut,likeberi/omniauth,twalpole/omniauth,dougal/omniauth,ngpestelos/omniauth,sideci-sample/sideci-sample-omniauth,intridea/omniauth,nbrustein/omniauth,ayunav/omniauth