Update billing agreement and plan data models
Add tests for billing plan/agreement
Update user-agent header
bump up version
Refactor sample code
Add JSON order samples
Add billing plan/agreement JSON
Fix test case issue
Merge branch 'rel-0.12.0' into stable
Merge branch 'stable'
Merge branch 'master' of github.com:paypal/rest-api-sdk-java
Remove unnecessary tests
Bump up version
Group integration tests
Merge branch 'rel-0.12.1' into stable
Merge branch 'stable'
Enable only unit tests for travis builds
Add unit test group tag to unit tests
Fix test case issue
Fix test case issue