.bash_prompt: Fix `parse_git_dirty` for Git v1.8.0+

Git 1.8.0+ says “nothing to commit (working directory clean)”.
Older Git versions return “nothing to commit (working directory clean)”.

Thanks to @nicolahery in #143 for the suggestion.
.aliases: Add `map`

Ref. #157.
.functions: Make `gz` more awesome
.aliases: Lowercase `com.apple.finder`

Hat tip: @alrra.
.osx: Show item info to the right of the icons on the desktop
.functions: Add `calc`
.bash_profile: Move the `LANG` & `LC_ALL` exports into `.exports`
.osx: Remove the iTunes Ping settings

Apple officially closed the iTunes Ping service on September 30th, 2012 (http://i.imgur.com/U7bHo.jpg).
.osx: Document the various values for Hot Corners settings
.osx: Clarify that the iTunes settings are for pre-iTunes 11 only
README: Update Lauri Ranta’s hidden preferences URL

The previous URL now 404s.
bin: Update to Bash 4.2.42
.osx: Fix typo

Ref. #183.
.functions: Add `getcertnames`

This function shows all the names (CNs and SANs) listed in the SSL certificate for a given domain.

As always, improvements and other feedback is welcome!
.functions: Improve `getcertnames`

Follow-up to 12bb9dac8ee7f4bcdf3e74fcbc0455a04be0211f.

Many thanks to @dserodio!
.osx: Tweak language settings comment

Fixes #189.
.osx: Show the path bar in Finder
.osx: Add Notification Center value for hot corners

Ref. #187.
.bash_profile: Support hostname aliases defined in `~/.ssh/config`

`~/.ssh/config` allows for the usage of hostname aliases, formatted as follows:

    Host first_alias second_alias third_alias
    HostName foo.example.com

This change makes sure these aliases are parsed out individually and added to the autocomplete list.

Ref. #178.
.osx: Disable Notification Center

This also removes the annoying menu bar icon.

Ref. #168.