Update dotfiles
Update deps
Use `files` property
Switch to use Chalk

https://github.com/sindresorhus/chalk
Code style and tweaks
Rename `optipng-bin` to `optipng`
Rename tests
Minor tweaks
Improve readme
Remove check for pre-existing binary
Rename `optipng-bin` to `optipng`
Merge branch 'master' of github.com:yeoman/node-optipng-bin into merge

Conflicts:
	lib/optipng.js
	readme.md