.osx: Add SSD-specific tweaks

Source: http://forums.macrumors.com/showthread.php?t=1505922
.osx: Remove broken three-finger swipe commands

If anyone knows how to make this work, please let me or @necolas know!

Ref. #171.
.osx: Don’t `kill` Dashboard

`killall Dashboard` doesn’t actually do anything. To apply the changes for Dashboard, `killall Dock` is enough as Dock is Dashboard’s parent process.

Closes #277.
.aliases: Add `afk` to lock the screen

Closes #258.
README: Document the `.cask` file

Closes #280.
.osx: Disable smart quotes and dashes
.aliases: Add `reload`

`reload` invokes the shell as a login shell, which essentially reloads it.

Closes #247.
.aliases: Update RubyGems before updating installed gems

Closes #282.
.aliases: Add `npme`

`npme` is like `npm` except it uses a registry located in Europe, causing it to be much faster for Europeans. See <http://npmjs.eu/> for more information.

Closes #284.
Use `Brewfile` now that Homebrew supports it

https://github.com/mxcl/homebrew/blob/master/Library/Contributions/cmd/brew-bundle.rb
https://coderwall.com/p/afmnbq
.gitconfig: Make `git rebase` safer on OS X

See <http://www.git-tower.com/blog/make-git-rebase-safe-on-osx/>.

Closes #291.
.aliases: Improve `lsd`

Ref. #292.
README: Use `Brewfile` instead of `.brew`

Closes #294.
.osx: Hide Safari’s sidebar in Top Sites by default

Closes #296.
.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These commands only work on outdated versions of OS X.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.
.gitconfig: Add `dm` alias

`git dm` deletes local branches that have been merged with master.

Closes #309.