[transform] postcssify transform

[youzi]

We have a work-in-progress version of the postcssify transform in feature/transform.

The transform attempts to handle everything within the scope of the transform, without needing using the transform globally or needing a separate plugin.

It tracks all the files that the transform is applied on and attempts to bundle when all files have been parsed/ handled.

We are now at a stage where we can make this transform really sweet by adding some nice options. Options I'm thinking about:

• output define where to leave the output (if true inject?)
• plugins define plugins to apply on each file (separately)
• bundlePlugins define plugins to apply on the entire bundle

Not sure about the keys for the options (especially bundlePlugins ofc)

/cc @vigour-io/front-end @shawninder

[shawninder]

yeah I originally had filePlugins and plugin, but I also thought we might want to find something better... I'll think about it.

[shawninder]

The transform version is the new #master, replacing the plugin approach I originally had.

[shawninder]

The rest of this issue is covered in #2 so I'm closing this one