Update gitignore.
vim: Add 'set binary'.
shell/aliases: Add some new aliases.

This adds the following.
- wanip   gets the WAN IP of the machine
- vpriv   private Vim
- h2d     hex to decimal
- d2h     decimal to hex
- gdb      -> gdb -q
- global E -> '| tee'
pentadactyl: Remove visual bell.

I don't like it.
shell/env: Make PATH /opt additions fail silently.