Merge pull request #19 from sergeylukin/freebsd-support

Add FreeBSD i386 binary
Added which check for system binary

Also added generic configuration for precompiled packaged binary.
Fixes #18.
Download binaries instead of including them
removing console.log from which check
Merge pull request #23 from badunk/master

Remove error message from which check
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
Download binaries to the vendor folder instead of bin
Add support for Solaris

Fixes #24.
Fix check for bin path
Add Solaris to supported systems
Update to jpegtran 1.3
Add Solaris to package.json