Use a module for the site.
Rename ServiceRegistry to Registry.
Rename Exchange to Context - closes #84.

This throws out a lot of the doc. Going to do that in a separate step.
Allow chains to be backed by a Registry - closes #95
Internal class name improvement.
Make the injector backed registry that backs Groovy chains and top level handler {} closure params able to create unbound instances.
Provide public factories for creating Guice backed registries.
Rework the bootstrapping/launching, to make test time launching more robust.
Javadoc fix.
Generify Registry.
Made ModuleRegistry a real Registry.
Revert Netty upgrade until we can resolve large file transfer problem

This reverts commit b77c8d1cb9c86d878d481db98954361d9b9354e9.
test for transmission of a large file

This fails when Netty is upgraded to 4.0.4.Final so the test should catch any regression as we try to fix the upgrade