Finally documented LZF format: https://github.com/ning/compress/wiki/LZFFormat

[Tatu Saloranta]

Not sure if anyone here is interested, but one item from my long TODO
list was to document LZF format, as defined by original lzf tool.
So here it is:

https://github.com/ning/compress/wiki/LZFFormat

Other recent news:

- Lz4 codecs (both JNI version and pure java) are included in
codebase, and give some rather impressive numbers -- fastest codec on
JVM for now
- I updated LZF version to 0.9.7, and now speed is quite similar to
Snappy/Java (which is actually similar to Snappy/JNI as well).

It certainly looks like 'sun.misc.Unsafe' is pretty much required for
top speeds on JVM -- for LZF, decompression speed is 2x that of "safe"
variant, and both LZ4 and Snappy java codecs similarly use it.

I still don't have a good answer to the question of how to automate
running (and ideally publishing) tests; and currently do not have
enough time to do that manually. But I am hoping that further
automation of cloud services makes the problem easier to crack over
time. :-)
And help in this area would obviously be appreciated.

-+ Tatu +-