Port javascript lz-string in JAVA version.

Port from original JavaScript version by pieroxy https://github.com/pieroxy/lz-string

Done some of language optimization after porting.

MIT License

See rufus.lzstring4javarhinotest.LZStringTest. Only the testing package need rhino. If you're not intrestring in testing, just get the rufus.lzstring4java package only, no rhino or any other third party package is needed.