Initial implementation of the Arithmetic encoder/decoder.
Fixed autobuilder link/icon in ReadMe, used to point at rs-splay.
Initial implementation of DC and MTF with basic tests.
Merge pull request #4 from kvark/t-dc

Initial implementation of DC and MTF with basic tests
Merge pull request #5 from kvark/t-ari

Initial implementation of the Arithmetic encoder/decoder.
Updating to the latest rust
Add flate decompression
Update doc examples to be tested
Add ZLIB decompression (based on flate)