Release 1.7.0

[suprnova32]

Now that all outstanding pull request have been merged, we can release 1.7.0.

A few days ago, ruby-saml version 1.4.0 was released recently with some security updates. I think we should bump the version used in omniauth-saml to 1.4.0. #117

@md5 @bufferoverflow what do you guys think?

[suprnova32]

After reading https://github.com/onelogin/ruby-saml#updating-from-13x-to-14x we should definitely include it in 1.7.0

[suprnova32]

Forgot to close the issue after releasing 1.7.0. Closing now.