Remove pgp plugin
When we serialize a ConfiguredInstantiator ensure we can deserialize, and create a Kryo from it

serialize synthetic fields in both scala and java by default

Test for NPE issue due to not serializing those fields
Merge remote-tracking branch 'origin/develop' into feature/fix-NPE

Conflicts:
	chill-scala/src/main/scala/com/twitter/chill/KryoBase.scala
Merge pull request #137 from twitter/feature/fix-NPE

Feature/fix npe