Adding browserify.transform to match browserify/grunt-browserify config

I stumbled over configuring browserify in moonboots because I was looking at my grunt configuration for grunt-browserify.  I then referenced the browserify docs themselves, and I saw that both reference the array of transforms as `transform: ['etc']`.

I added support for `transform`, and kept `transforms` for backward compatibility in moonboots.  I updated the documentation to reference `transform`, but I couldn't find see a way to mark `transforms` as deprecated in the source code.

I also copied and pasted the transforms test; I'm not sure if I should write it differently.