Added param mapper
Added http status enum
Added implicits from status to response
Converted over to new DSL
Added entity tests
Updated akka package for new DSL
Moved entity and param chained processors to top level classes
Added tests for request entity size 413
Updated group method to use options
Updated client to return Option[String] for header methods
Moved path matcher to explicit checks in channel handler
Fixed processor dsl to be lazy
Fixed param marshalling directive