Small compression improvement
Merge pull request #6 from neheb/master

Small compression improvement
Add arithmetic coding support
Merge pull request #7 from neheb/master

Add arithmetic coding support
Update jpegrescan

"If you use jpegrescan twice on a file, it grows back the file size." via Hanno Böck
Tiny Compression improvement
Merge pull request #8 from neheb/master

Tiny Compression improvement
Update jpegrescan
Rename readme.md to README.md
Merged with latest changes from kud