Moving more classes, renaming things cleaning up how we deal with Events.
Merge branch 'model_refactor' of github.com:twitter/ambrose into model_refactor

Conflicts:
	common/src/test/java/com/twitter/ambrose/service/impl/InMemoryStatsServiceTest.java
Updates jackson to com.fasterxml.jackson 2.1.1
Sets default jackson field inclusion to NON_NULL and removes per class overrides