Add transitive dependencies from test-jar
Remove notions of layout in SentryAPpender
Rename the plugin into Raven and make it a part of Core
Fix typo
Change the name of the class in error messages
Move event building in a dedicated method
Allow JsonMarshaller to handle arrays and iterables

By default the JsonGenerator.writeObject method only handle primitives
not arrays or iterables. This add a light support for those objects
Add integration tests for log4j2