Bug: yahoo import

[Ricardo Pacheco]

Started GET "/contacts/yahoo" for 127.0.0.1 at 2014-09-03 21:18:53 -0300
Error internal_error while processing /contacts/yahoo: oauth_problem=signature_invalid

Configuration is the same of README!

[Vinicius Ferriani]

Please get the latest version of the gem on github (not on rubygems). You may also want to apply #111 to fix hotmail issues. Thanks @bigxiang !

[Ricardo Pacheco]

it's works, thanks!