including MRI Ruby 2.1.0 in .travis.yml
updating license information (https://github.com/kbeckman/omniauth-wsfed/issues/11)
bumping omniauth version to 1.2.0+ (https://github.com/kbeckman/omniauth-wsfed/issues/13)
Travis CI config changes (aligning with omniauth 1.2.2)
locking in rake dependency version to ~> 10.1.0 to try and fix rubinius build error
second shot at fixing the rake dependency...
updating Travis CI config to allow certain failures
undoing rake version tweaks
bumping the gem version to 0.2.3
gemspec changes to resolve 'gem build' warnings
Merge branch 'release-0.2.3'