Replace Array[Byte] with a ByteString.

This considerably reduces the copying of byte arrays.  We get a 5X
performance boost in the /bigstring case with servlets.

Grizzly and Netty do not compile yet.  They will need to be reenabled
in the build and their examples uncommented.
Eliminate references to raw.

No need to give it a second name.  ByteString is a good name, and
familiar to many Akka folks.
Put Grizzly and Netty back in business.