Couple of typos

Very handy lib, thanks. Couple of little changes required I reckon -

in TurtleParser.js, line 64 :

if(typeof(callback)=="function") cb(this.graph);
=>
if(typeof(callback)=="function") callback(this.graph);

in README.md, line 41 :

var turtleParser = new (require('rdf/TurtleParser').Turtle)(profile);
=>
var turtleParser = new (require('rdf/TurtleParser').Turtle)(env);

(I assume this is the case, noting the description of env that follows)