Setup global key bindings for Org

Instead creating and using org-loaddefs, just use use-package to load
org and org-agenda as needed.
Bind Alt and Meta as Meta to support muscle memory

This helps since I use Mac's with differing keyboards and keyboard
layouts, placing a Meta key where my muscle memory expects to find
them on all of my systems.
Use a hook to load quilt-mode when needed
Select a font that works better in X11 on Mac OS

Add two fonts to `face-font-family-alternatives' that work well on Mac
OS.  This includes "Liberation Mono" and "DejaVu Sans Mono", which
have a more consistent stroke-weight and appearance in this particular
scenario than my preferred Source Code Pro.
Set a consistent default font size