improved node ToString performance
added Error class (not fully implemented yet)
ignoring some intermediate files
pre-define 'undefined'
improved tokenizer speed by not using regex
fixed calling of overloaded external functions; sometimes incorrect function would be called (exampe: new Date(2000,1,1) would result in calling default constructor)
- while loop was completely broken (would loop forever)
- return w/o value would result in crash
- strict eq/ne were broken for strings, numbers