brew.sh: Use `--with-iri` for `wget`

The older `--enable-iri` flag is deprecated.

Closes #445.
.exports: Remove `export HOMEBREW_CASK_OPTS`

It’s not needed anymore now that the `Caskfile` has been removed.

Closes #446.
.aliases: Remove npmjs.eu reference

See the deprecation notice: http://npmjs.eu/

Closes #448.
.functions: Make `mkd` `cd` into the last directory in the list

…rather than the first.

Closes #447 and #450.
brew.sh: Install Lua the new way

Closes #453.
.osx: Update `iOS Simulator.app` path

The iOS Simulator app has been moved.

Closes #452.
brew.sh: Update `gnu-sed` option

Closes #454.
.osx: Disable Spotlight suggestions from Safari

Safari has a “Spotlight Suggestions” setting that, if left enabled, will send a copy of all search queries to Apple.

Closes #455.
.osx: Add Yosemite’s search results for Spotlight

Yosemite introduces new Spotlight search results, and if you don’t add it to `defaults write com.apple.spotlight orderedItems` it will be removed from the System Preferences → Spotlight → Search Results` list with no way to re-enable them through the System Preferences panel.

Closes #456.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  .osx: Add Yosemite’s search results for Spotlight
  .osx: Disable Spotlight suggestions from Safari
  brew.sh: Update `gnu-sed` option
  .osx: Update `iOS Simulator.app` path
  brew.sh: Install Lua the new way
  .functions: Make `mkd` `cd` into the last directory in the list
  .aliases: Remove npmjs.eu reference
  .exports: Remove `export HOMEBREW_CASK_OPTS`
  brew.sh: Use `--with-iri` for `wget`