Added cask for Mac Linux USB Loader.

Added a cask for my application [Mac Linux USB Loader](http://sevenbits.github.io/Mac-Linux-USB-Loader/) version 2.0.

From the homepage:

> Mac Linux USB Loader is an application that allows you to create bootable USB drives containing a Linux distribution that can boot natively on Apple's Macintosh computers using its EFI system, regardless of whether or not the selected distribution has UEFI support.