Behatrix

added Behatrix in Python Package Index (PyPI)

fixed bug in interface update after the permutations test

Added possibility to use the **viz.js** javascript (included in executable packages) to produce the flow diagram (instead of the dot program from the GraphViz package)

See https://github.com/mdaines/viz.js for details

Introduced the n-gram statistics (for n in {2,3})