[mattbostock] Remove duplicate `gds-development`
[mattbostock] Add adium, alfred, openconnect, zsh
[mattbostock] Remove Github for Mac
[mattbostock] Add Vagrant cachier plugin
[mattbostock] Remove Vagrant DNS plugin
[mattbostock] Add spacing
[mattbostock] Set password timeout delay to zero

The OSX module used by boxen defaults to a 5 second delay between the
time you lock your screen and the time OSX will start prompting for a
password.

Set the delay to zero, so that as soon as I have locked my screen, OSX
will prompt for a password.
Merge pull request #62 from alphagov/mattbostock

Changes for Matt Bostock