KeyType toString fix and assign datastore-generated IDs into domain objects when saving fix
Merge pull request #51 from mogupta/LongKey-null-fix

KeyType toString fix and assign datastore-generated IDs into domain obje...
fix NPE when assigning datastore-generated IDs into domain objects when
saving collection
Merge branch 'master' of https://github.com/adennie/vroom

Conflicts:
	vroom-core/src/main/java/com/fizzbuzz/vroom/core/service/datastore/VroomEntity.java
[maven-release-plugin] prepare release 0.9.15
[maven-release-plugin] prepare for next development iteration