Merge pull request #34 from korczis/doc

Rake Refactored, Yard Refactored and improved, Spec bit restructed ...
Updated gems
Merge pull request #35 from korczis/update-gems

Updated gems
Merge pull request #36 from korczis/doc

Doc - Ported all pages including all tutorials
Merge branch 'master' of github.com:gooddata/gooddata-ruby into doc