.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.
.aliases: Add `chromekill` to kill all Chrome tabs to free up memory

Useful when you have a lot of tabs open (which I always do), but you don’t want to close them.

Tabs in Chrome are just processes, so we just filter out the ones we want, and kill them.

Closes #236.
.osx: `~/.CFUserTextEncoding` can break several Adobe apps

Ref. #237.
.gitconfig: Add comment about `color.ui` in Git ≥ 1.8.4

Ref. #239.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  .gitconfig: Add comment about `color.ui` in Git ≥ 1.8.4
  .osx: `~/.CFUserTextEncoding` can break several Adobe apps
  .aliases: Add `chromekill` to kill all Chrome tabs to free up memory
  .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