.vimrc: Avoid creating backups when editing files in `/tmp`

See http://vim.wikia.com/wiki/Editing_crontab.
.aliases: Remove the now-broken `whois` alias

Closes #397.
Rayne: Change hidden icons
Rayne: Don't hide Notification Center
Rayne: Don't disable Time Machine
Rayne: Don't change trackpad settings
Rayne: Don't change locale
Rayne: Default Finder directory is home directory
Rayne: Don't disable Dropbox icons
Rayne: Don't modify Hot Corners
Rayne: Remove settings for unused applications