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

Ref. #239.
.gitconfig: Add note about whitespace defaults

Closes #256.
.functions: Add `m` to open stuff in TextMate

Closes #253.
.functions: Add `s` to open stuff in Sublime Text

Closes #252.
.functions: Add `v` to open stuff in Vim

Closes #251.
.bash_profile: Make sure only files get sourced

Closes #250.
.functions: Add `o` to `open` stuff

Closes #245.
Add `np` function to ease publishing node modules

I use this to ease the publishing of npm modules. `np`, done ;)

np = npm publish (and, `no problem`, (and `nutella party`))

Closes #261.
.osx: Remove “Enable access for assistive devices”

This feature doesn’t work anymore in OS X 10.9 Mavericks. The setting has moved to System Preferences → Security & Privacy → Accessibility, where you now have to check every app you want to allow access rather than enabling it globally.

Closes #262.
.osx: Use plain text smileys in Messages

Messages in OS X 10.9 Mavericks automatically substitutes e.g. `:)` with `😊`, with no way to disable this feature through the app’s preferences pane.

After analyzing the `defaults read` output it turns out there is a hidden preference for it.
.osx: Consistently specify the type for `dict-add` actions
.functions: Add `tre` shorthand

Closes #249.
.osx: Disable smart quotes in Messages.app
.osx: Disable continuous spell checking in Messages.app
.brew: Move casks to their own file
.osx: Add threaded email display settings for Mail.app
.osx: Remove old iTunes commands

They only applied to iTunes 10 and older anyway.
.osx: Make coding style more consistent
.osx: Disable inline attachments in Mail

Thanks to Christophe Platteeuw via Twitter: https://twitter.com/cplatteeuw/status/393465401310318592
.osx: Disable automatic spell checking in Mail.app