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
Introduce new body methods so one can control the output

Useful when setting a request body processor that only supports a given
type of input
Introduce streamRequestBody built in request body processor
Minor clean up
Remove asStream built-ins that are redundant with streamRequestBody processor
Use fastring template for protocol configuration + fix recorder output
Merge pull request #1071 from pdalpra/recorder-cleanup

Use fastring template for protocol configuration + fix recorder output
Minor clean up
Externalize Gatling status codes
Clean up Http request/response
Fix build
Introduce response processor, close #1033