Update to doorkeeper 1.4.0
Add support for Resource Owner Password Credentials
Add some form updates
Merge pull request #26 from opscode/jc/doorkeeper-1.4.0

Update to doorkeeper 1.4.0
Merge pull request #27 from opscode/cn/password-grant

Add support for Resource Owner Password Credentials
Add mixlib-authentication 1.3.0
Added certificate based resource owner password flow
start breaking out auth into user model
rename method
finish up implementation and spec