Remember the Milk workflow for Alfred

This is a small workflow that leverages Tim Pope's rumember to quickly add tasks to Remember the Milk via Alfred

It is heavily based on Matthew O'Riordan's workflow (GitHub), with a few changes:

• uses zsh instead of bash
• different icon (which I prefer in the Solarized-Dark theme I use with Alfred)
• only add the directory to $PATH if ru exists in the directory
• adds $HOME/.rbenv/shims as one of the possible locations of ru

(that last one is what prompted making a new workflow)

Note: this workflow requires that you have rumember installed and authenticated