Espruino command-line and NPM module

Thanks @Gordon! Looks great, nice readme!

Looking through the to-do section, I'm not sure if it's worth adding a file watching feature, since people will have their own that they use (maybe with gulp/grunt and their own development environment).

Something that could be useful would be to write to a file instead of to the espruino board. As in, it grabs all the modules from the espruino website, assembles the "addcached" call, minifies, and then writes all these commands into a js file for someone to be able to upload later, or keep a copy of, or to debug. Basically, to act like browserify. :P