Merge pull request #7 from kivra/master

Update to kivra/oauth2 master
Update README
More README updates
Start work of 0.3.0
wrong tag link in README
Added scope and fixed error codes in refresh_access_token
Added missing invalid_grant error type
Merge remote-tracking branch 'origin/refresh_token'
Merge pull request #8 from kivra/master

Update to kivra:master
Merge pull request #9 from kivra/master

Update to kivra/oauth2 master