charng.js added, from WebText js-lib 'markov2.charng.js' - adapted from original HTML-integrated code by Edde Addad.
renamed inputString to input; cleanup per linting, packaged as node module
first REALLY BORING API tests for charng
Merge branch 'master' of https://github.com/MichaelPaulukonis/NaNoGenMo.yawp