Refactor Flow API.
- Use builders for all nodes.
- Separate Source, Sink, and Nodes from processing at those nodes.
- Change API to be more intuitive.
Fixed test
Refactoring for proxy mode.
Refactor for Nodes with multiple destinations (branches).
Add conditional relay branching with lambdas!
Refactor Message to use ByteBuffers.
Remove commented-out "hasSendTarget" artifact
Merge pull request #3 from mattvryan/mryan

Adds flow, node, source, sink, and message.