Merge pull request #6 from pemulis/master

Adding a group method
new clients default to global config
Merge pull request #8 from ivanoblomov/master

New clients default to global configuration
clarified oauth token as access (instead of request)
fixed parsing bug: oauth_request asks for an XML response
added friends
covered friends
truncated friends fixture
raised total coverage to 99.35%
Merge pull request #10 from pemulis/master

Groups Documentation
Readme updates
Add ruby 2.0.0 to travis config
Merge conflict
Remove api key from fixture
Use secure rubygems url
Set rspec version to 2.12
Refactor specs