File paths for Sublime Text 3 on OS X:
~/Library/Application Support/Sublime Text 3/Packages/User/run_multiple_commands.py
~/Library/Application Support/Sublime Text 3/Packages/User/Default (OSX).sublime-keymap
Credit to http://stackoverflow.com/questions/13388477/multiple-commands-in-a-single-sublime-text-2-user-keymap-shortcut for original source.
I had to add a "selected_text" condition because slurp should not run if there's no text selection.