Upgrade to Netty 3.6.4
Merge pull request #1069 from nremond/netty

Upgrade to Netty 3.6.4
Replace Scalate templates by fastring in Recorder, close #1065
Closes #1070
Clean up body implementations, isolate Scalate engine
Minor clean up
HttpRequestBody clean up, handle SSP Exceptions
Introduce Request bodies processor, close #1002
Introduce RequestBodyProcessors gzip built-in, close #1014