.osx: Add GPGMail 2 settings

http://support.gpgtools.org/kb/faq-gpgmail/gpgmail-2-hidden-settings
.osx: Disable the sound effects on boot
.aliases: Add `-F` to `ls` aliases

Don’t do this for the default `ls`, though.

Closes #234.
bin: Point `subl` to the default ST3 location

Sublime Text 3 does not use the `/Application/Sublime Text 3.app` folder by default. It uses `/Application/Sublime Text.app`.

Closes #232.
.gitconfig: Remove global remote branch

This causes duplicate remotes to be created, potentially leading Git to throw errors when `push`ing.

Closes #215.
Merge branch 'master' of https://github.com/mathiasbynens/dotfiles

* 'master' of https://github.com/mathiasbynens/dotfiles:
  .gitconfig: Remove global remote branch
  bin: Point `subl` to the default ST3 location
  .aliases: Add `-F` to `ls` aliases
  .osx: Disable the sound effects on boot
  .osx: Add GPGMail 2 settings
Merge branch 'master' of git://github.com/lexrus/.files

* 'master' of git://github.com/lexrus/.files:
  Avoid Debian plugin by default