Refactor deployment to return VineContext instances rather than Feeder instances in order to support custom feeders.
Add custom feeder interfaces and implementations.
Add custom executor interfaces and implementations.
Add new custom feeder example.
Add new context/feeder wrappers to the Python API.
Add reliable executor that tracks acking the execution results.
Fix various exceptions in testing.
Fix bugs in new testing new feeder implementations.
Remove basic/reliable seed verticles replaced with a single SeedVerticle implementation.
Update tests for new SeedVerticle implementation.
Update Python API for new Feeder and Executor implementations.
Remove old net.kuujo.vine.Feeder and net.kuujo.vine.BasicFeeder implementations.
Remove obsolete VineVerticle.