Persistent class + deepPersistent
Merge branch 'transientMap' of github.com:vacuumlabs/persistent into newData

Conflicts:
	lib/src/map.dart
	lib/src/persistent.dart
merge
Repair merge
Repair merge
add containsKey
Merge pull request #5 from vacuumlabs/newData

New data
Merge remote-tracking branch 'origin/transientMap'