[shell] Add `npme` alias

Create alias for `npm` that uses the registry located in Europe.

See also: http://npmjs.eu/
[shell|vim] Disable beeping and window flashing

Both `vim` and the `terminal` beep or flash their windows if an error
occurs. This commit disables that behavior as it is really annoying.

See also:

 * http://vim.wikia.com/wiki/Disable_beeping
 * http://ss64.com/bash/syntax-inputrc.html