.osx: Use `sudo` for `systemsetup`

Closes #415.
.osx: Disable the all-too-sensitive backswipe on Chrome

Closes #416.
Merge branch 'master' of github.com:mathiasbynens/dotfiles

* 'master' of github.com:mathiasbynens/dotfiles:
  .osx: Disable the all-too-sensitive backswipe on Chrome
  .osx: Use `sudo` for `systemsetup`

Conflicts:
	.osx
.osx timezone to use New York