Started moving changeset to sub-namespace
Removing 5.3 from build matrix
removing unused API
Removing references to ChangeSet
Event triggering moved to the unit of work
Removing old todos
Enforcing PHP 5.5 and HHVM builds pass
Merge pull request #18 from Ocramius/feature/hhvm-build

Enforcing PHP 5.5 and HHVM builds pass
Merge pull request #8 from Ocramius/hotfix/api-cleanup

[WIP] API cleanup
Including new set of minimal requirements
Refining requirements - snapshots now produce new snapshots if the state of an object changed
SnapshotManager is now responsible of creating and comparing snapshots
Cleaning up requirements leftovers
First draft of the snapshot and snapshot manager interfaces
First basic implementations of snapshot tests
Adding simple comparison method to the SnapshotManager
PHPMD is not required anymore