Rename JsonUtilsTest to JsonSerializationTest
Refactor Payloads to accept few arguments, and pull data from context and traits
Reformat Javadocs
Rename Test clases
Add tests to verify basepayload pulls informaiton correctly
Add test for BasePayload serialization
TrackPayload serialization tests
Merge pull request #148 from segmentio/prateek/serialization-tests

Tests for Payload Serialization