Update .osx file
.curlrc: Disguise as IE 9 on Windows 7

This matches the `.wgetrc` settings.
.aliases: Add `timer`

`timer` can be used as a stopwatch.

Hat tip: https://twitter.com/tow8ie/status/360077953238962176
.gitconfig: Improve display of astral Unicode symbols in diffs

Thanks to @holman for the tip: https://speakerdeck.com/holman/more-git-and-github-secrets?slide=38
.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.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  .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
  .gitconfig: Improve display of astral Unicode symbols in diffs
  .aliases: Add `timer`
  .curlrc: Disguise as IE 9 on Windows 7
pull changes from upstream, modify a little