.gitconfig: Add aliases to find branches/tags/commits

Closes #304.
bin: Make `httpcompression` prevent caching

In some cases, intermediate proxies ignore the `Content-Encoding` header
altogether.

Sending `Cache-Control no-cache` as a request header solves this problem
by forcing validation of the resources in the intermediate proxies,
thereby, ensuring that every request is fetched from the origin server.

Ref. alrra/dotfiles#2. Closes #308.
init: Fix typo in Sublime Text settings
.osx: Hide some menu bar icons in OS X 10.9 Mavericks

Kudos to @kevinSuttle for finding the appropriate `plist` file!
https://github.com/mathiasbynens/dotfiles/issues/305#issuecomment-30102827

Ref. #305.
.osx: Delete some old commands that no longer work

These commands only work on outdated versions of OS X.

Ref. #305.
Tighten up security.

* Enable Firewall (specific services, stealth mode, logging).
* Disable IR remote control by default.
* Optionally turn Bluetooth off.
Disable AutoFill in Safari.
Merge branch 'osx-sec' of https://github.com/ezhuk/dotfiles-1 into osx-sec