Fix endpoint URI and resouce module mapping

- Point to correct endpoint base (https://www.dwolla.com/oauth/rest)
- Pluralize API class name when mapping to endpoint
Fix endpoint URI and resource module mapping

- Point to correct endpoint base (https://www.dwolla.com/oauth/rest)
- Pluralize API class name when mapping to endpoint
Merge branch 'master' of github.com:wayoutmind/dwolla-sdk-scala into wayoutmind-2
Merge branch 'wayoutmind-2' of github.com:wayoutmind/dwolla-sdk-scala into wayoutmind-2
Merge pull request #2 from wayoutmind/wayoutmind-2

Fix endpoint URI and resource module mapping
Merge branch 'master' of github.com:coreyjonoliver/dwolla-sdk-scala
Document required properties