.osx: Add GPGMail 2 settings

http://support.gpgtools.org/kb/faq-gpgmail/gpgmail-2-hidden-settings
.osx: Disable the sound effects on boot
Merge branch 'master' of https://github.com/mathiasbynens/dotfiles into work

* 'master' of https://github.com/mathiasbynens/dotfiles:
  .osx: Disable the sound effects on boot
  .osx: Add GPGMail 2 settings

Conflicts:
	.osx
Merge branch 'master' of https://github.com/Aghoreyshi/dotfiles into work

* 'master' of https://github.com/Aghoreyshi/dotfiles:
  Place screenshots in a dedicated folder
Add git completion
Stop bin and init directories from being copied to $HOME
Remove personal configuration such as git username from this repo