Pluginify not works in Node

This is a major update to pluginify for Node which fixed 2 of its biggest issues:

1) Because pluginify wasn't calling the callbacks we would be unable to produce standalones for projects that used ejs or mustache. The callbacks are necessary to produce the JS that those plugins depend on.

2) The way the dependency resolution happens, there was a bug when a file steals less/css files (or any other file type that doesn't become part of production.js). This bug is now fixed.

Related #150