Bind Ctrl+Left to emacs-backward-word (and Right to forward)

Binds some additional sequences to emacs-backward-word and
emacs-forward-word. The problem is that terminfo doesn't know about
Ctrl+ArrowKeys, so one has to resort to using raw sequences as used
in the wild. The sequences were copied from Debian's /etc/inputrc
(readline configuration), so they should be fairly portable.
It works in xterm and rxvt terminals and doesn't work on
TERM=linux (virtual console) as Ctrl+Arrows send the same sequence
as Arrows alone.

http://zshwiki.org/home/zle/bindkeys
http://sources.debian.net/src/readline6/6.2+dfsg-0.1/debian/inputrc?hl=44#L44