Add store as devDependency (for testing only: PesistentIndex).
Bring back images.
Updated  package.json
Begin IndexedDb support.
Iterator for changes that respects dependency order.
Initial implementation of the IndexedDbBackend.
Initial test for IndexedDbBackend.
Add an helper to create to import persistent changes more easily.
Bugfixes.
Add support for snapshots to IndexedDBBackend.
Tests for snapshots in IndexedDB backend.
Minor fix in IndexedDB backend.
Export IndexedDB backend.
Merge remote-tracking branch 'experimental/indexeddb' into 0.3.x

Conflicts:
	package.json
A bit more robust cb calling.
Overwrite existing changes.

Later we will do this more clever.
Overwrite snapshots.
Thorough indexeddb deletion.
Fix chronicle.find().
Save Chronicle refs.