Initial implementation of the test app, supports BWT only for now. Computational BWT functions are moved out of the Encoder/Decoder.
Merge pull request #7 from kvark/t-ari

Ari improvements in abstraction, naming, and benchmarks.
Update the compiler flags
Merge pull request #8 from kvark/t-app

[WIP] Test application
A simple binary model for arithmetic coder. Better cut mechanics.
Whole range alphabet support is added for DC.
Helper Encoder/Decoder classes for the Arithmetic