remove gradle related build artifacts
Merge pull request #47 from foldlabs/remove_gradle

remove gradle related build artifacts
Create a maven profile for travis, that excludes jacoco
Remove sunjdk6 from travis.yml; it is no longer available on travis
Just package, don't try to deploy on travis
Merge pull request #49 from justinsb/fix_travis

Fix the travis build: exclude jacoco, sunjdk6; don't deploy
Verify the previous state as part of every state transition
Merge pull request #41 from justinsb/check_state_transitions

Verify the previous state as part of every state transition