Key Binding Guide

[cowboyd]

Part of #63

We use a lot of packages in frontmacs, and bind a bunch of custom keys. It's too bad that someone coming in not knowing anything would be completely lost. For all our custom keys, and for those that are really super handy that we bind by default, we should explain

1. the pnemonic strategy (i.e. the C-c p prefix stands for project)
2. the binding
3. links out to external reading resources if necessary.