Merge pull request #1 from boneill42/master

Contribution from @leerobert
Merge pull request #2 from boneill42/master

Incremental State working with a couple unit tests.
Merge pull request #4 from boneill42/master

Cleanup, with working incremental state.
Merge pull request #5 from boneill42/master

Backing Map Implementation and Retry for Incremental State
Update to the groupId.