Make a JS interface for regex2dfa

[kpdyer]

Use emscripten to compile regex2dfa to JS.

[kpdyer]

The following now works:

var regex2dfa = require('./.libs/regex2dfa.js');
var regex = "^(a|b)*$";
var dfa = regex2dfa.regex2dfa(regex);
console.log(dfa);

and outputs

0    0    97    97
0    0    98    98
0