Zsh: add ^xe binding to edit command line
Zsh: add ^xe binding to edit command line

This binding drops you into your EDITOR to edit the current command
line; handy for long/gnarly commands.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent