Create makefile with rsync for dist folder

I just threw together this quick makefile with rsync for `app/assets/stylesheets/ => dist/`, after talking to @plapier about some bower stuff. Hopefully it'll [*make*](http://i.imgur.com/xgO5PG4.gif) it a bit easier to keep the two folders in sync.

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**Changes:**
- Created `Makefile` with one way `rsync` from `app/assets/stylesheets` to `dist/`

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Let me know if you need anything else