avoid batch files

[jsoref]

@rcruz @kflores772 here's a draft which at least seems to work on OS X (I'll test w/ Windows tomorrow).

[rcruz]

To clarify, this change skips the "webworks" command and directly runs node with a particular file? While this may run the same files in node, the action is no longer exactly equivalent to running a "webworks" command on terminal. This would mean we still have a problem with stdout/stderr on the "webworks" command, but we are avoiding it by implementing a workaround into the GUI. @bryanhiggins @kwallis Is this the approach we want to take?

[bryanhiggins]

AFAIK this does not affect the console only the values returned in the child process callback

[rcruz]

Quick test shows this change works on WinXP

[rcruz]

r+, merged