Upgrade LZ4 to version 1.1.0.

Hi,

Here is a pull request to upgrade LZ4 to version 1.1.0. One advantage of this new artifact is that it has been packaged with pre-compiled JNI bindings (for win32/amd64, linux/i386, linux/amd64 and darwin/x86_64) so I added a driver based on JNI bindings to the C library.

In case you want to have a look, I ran the compress and uncompress benchmarks on the calgary corpus:
  - http://jpountz.github.com/lz4-java/1.1.0/lz4-compression-benchmark/
  - http://jpountz.github.com/lz4-java/1.1.0/lz4-decompression-benchmark/
(I had to increase the maximum throughputs in DriverBase.java so that the limit wasn't reached on every file with LZ4 (JNI).)