Document Node API

[paulcpederson]

document how a developer would use acetate from Node. Probably like:

var acetate = require('acetate')

acetate(options, function (err, success) {
  // whatever
})

I assume the interface is something like that.

[patrickarlt]

This is actually already documented it just labeled under Gulp http://acetate.io/documentation/gulp-usage/

[patrickarlt]

I also want to document the methods and events on the Acetate object itself since they would be useful for custom integrations.