It works! Well, sorta.

* Added setup file.
* Added i18n file; i18n *definitely* not yet ready!
* Added functions for loading skin CSS & JS via ResourceLoader (JS not ready yet)
* Renamed a bunch of i18n messages used by the skin so that they have the bluesky- prefix
* Removed all instances of wfGetPad(), it's a CDN-related function specific to wikiHow
* Fixed a bunch of E_STRICT junk
* Ported over some necessary functions from other wikiHow extensions
* getCategoryLinks() has a nasty debug line ($usebrowser = false;) and it needs some lovin'
* Ported wikiHow's core hack to includes/User.php -- the hasCookies function -- over as function userHasCookies() and made use of it
* s/->text()/->plain()/g for some Message objects to reduce reviewer anxiety
* Toned down the excessive amount of hacks specific to the English version of wikiHow ($wgLanguageCode == 'en')
* Removed more wikiHow-specific advertising code
* Fixed the head element generation
* Added support for the SkinAfterContent hook
* Replaced 'sub_footer_new'/'sub_footer_new_anon' i18n messages with a more MediaWiki-esque, hard-coded footer

Change-Id: I2f5085c8093ebb5881f6f93004a976dd655ab8a8