Finished the project.

Final commit includes:
* updated PHP classes
* updated Special Page
* i18n file with English messages
* maintenance script for generating static HTML pages in all available languages
* generated static HTML error pages.
Merge branch 'akarminski-friendly-errors' of https://github.com/Wikia/app into akarminski-friendly-errors

Conflicts:
	extensions/wikia/FriendlyErrorPages/FriendlyErrorPages.i18n.php
	extensions/wikia/FriendlyErrorPages/maintenance/FriendlyErrorPagesGenerator.class.php
	extensions/wikia/FriendlyErrorPages/templates/errorpage.html