Merge pull request #29 from jonathanchrisp/staging

Refactored error messages, oauth_token responses now returns body and bug fix, updated gem to version 3.0.0
Fixed update_project_sharing_user to pass opts and fixed comment typos
Merge pull request #30 from jonathanchrisp/update-project-sharing-user--opts-fix

Fixed update_project_sharing_user method to pass opts hash and updated comments