tsumego.js 0.1

Two builds included:

• The es6 one uses generators and works in latest releases of Chrome, FF and Opera (doesnt work in IE, obviously). If possible, use this build. See the included es6.html with an example of use.
• The es5 one doesn't use any advanced es6 features and should run in pretty much every browser, but it's about 1.5x slower. Moreover, to use this build, the FB's regenerator library must be loaded first (included in the package). This is because the es5 build was produced from the es6 one with Babel by transpiling generators into state machines that use the FB's regenerator runtime library. See the included es5.html with an example of use.