Add install instructions to readme
Update dotfiles
Use `files` prop
Update deps
Rename `optipng-bin` to `optipng`
Rename tests
Switch to Chalk

https://github.com/sindresorhus/chalk
Code style and improvements
Remove check for pre-existing binary
Renamed jpegtran-bin to jpegtran
Merge branch 'master' of github.com:yeoman/node-jpegtran-bin

Conflicts:
	lib/jpegtran.js
	readme.md