Merge pull request #5 from kivra/master

Update to kivra/oauth2 master
Merge pull request #6 from kivra/master

Update to kivra/oauth2 master
Separated token issuing from request authorization. Renamed
issue_code_grant to authorize_code_request. Renamed Identity to Client
or ResOwner depending on the case.
Whitespace and doc-fixes
Merge branch 'IvanMartinez-separated_authorize_issue3'