Allow for npm install -g tracegl

[balupton]

The install instructions for this are pretty complicated, can it be updated to use npm or something?

[onejsdev]

Feel free to make an npm package for it if you want. Its really just a git clone and throw the js file somewhere you can access it from path, thats about as easy as things get.

[fibo]

It seems it is already on npm https://www.npmjs.com/package/tracegl