Add esc; binding for paredit-down-sexp
Automatically generate esc; key bindings

So that nobody every again forgets about adding them.
Don't list esc; key bindings in README

Add a note instead, that all m: key bindings are accessible using Escape
like in Emacs, and explain where to see the actual list of applied key
bindings in DrRacket.
Add some comments for define-shortcut internals
Merge pull request #4 from pitkali/auto-esc

Automatically generate esc; key bindings