Remove shim files that were created to address #1873.

refs #1873

- Removes all shim files.
Merge pull request #2098 from hswolff/remove-file-shims

Remove shim files that were created to address #1873
Swap out Ruby Sass for Node Sass

- Uses Node Bourbon https://www.npmjs.org/package/node-bourbon
- Produces source maps
- Removed all ruby dependencie

History:
- Remove bourbon from package and cleanup grunt tasks
- Un-bourbon keyframe animations
- Un-bourbon transitions
- Un-bourbon box-sizing
- Un-bourbon font-feature-settings
- Import bourbon clearfix mixin
- Un-bourbon linear gradients
- Un-bourbon input types
- Un-bourbon positions
- Un-bourbon transforms
- Un-bourbon notification animations
- Un-bourbon uploader box-sizing
- Un-bourbon border-radius
- Un-bourbon splitbutton transitions
- Add triangle mixin
- Un-bourbon default container positioning
- Un-bourbon flexbox properties
- Fix triangle mixin - It now has the same output as the Bourbon mixin
- Add autoprefixer
- Correct global default font size
- Remove unwanted prefixes - Because, y'know, autoprefixer
- Output from node sass migration - Includes all the files we usually have, plus source maps
Merging Ghost-UI back into the Ghost repo
Moving files