Framing Format Support

[eapache]

Similar to #4 but this is standardized now and part of the upstream project (as of r126) so it should be as simple as pulling in the new upstream code and writing another wrapper. We need this for IBM/sarama#256 if at all possible.

[jgrahamc]

Which functions do you need?

[eapache]

The functions in https://code.google.com/p/lz4/source/browse/trunk/lib/lz4frame.h?spec=svn126&r=126, although I think just LZ4F_compressFrame and LZ4F_decompress might be enough. It's hard to tell without experimentation since Kafka's documentation on exactly which framing options they used is rather incomplete.