NPM package file and a couple of fixes

[kaievns]

Hi Chris,

I've made a simple npm package so people could install and use envjs with npm.

And I also did couple of fixes to make it run on node.js (not sure if I've done it the right way though).

Cheers,
Nik

[thatcher]

This is awesome, thank you! I'll try to get it integrated asap, but it might take a couple days.

[kaievns]

sure, no hurry with that, anyone can install it locally without actually having it on the NPM server.

btw, there is no window or document variables in node when you include the envjs/node.js file, I currently create them manually via var window = new Window(). Well, just letting you know, not sure what's the plan.