Extension:Add HTML Meta and Title/de-formal

The Add HTML Meta and Title extension allows for easier SEO (search engine optimization) with MediaWiki. It is based in part on the extension.

Usage
When you enter the following in a wiki page:

...or the shorter...

...these words are added to the HTML title and meta headers. This makes SEO (search engine optimization) with MediaWiki easier.

For example, the above would become:

(These are new meta tags - existing metas are left untouched.)

Changelog

 * v0.7.0
 * added support for PHP CodeSniffer checks.
 * fixed any remaining errors and warnings.
 * v0.6.0
 * added Google's site verification tag.
 * v0.5.1
 * modified to work with MW versions 1.1.2 and up (Revision by Mic)
 * v0.4.0
 * have put  in the parseSEO function because I got some nasty PHP notice for an unitialised variable...
 * v0.2.0
 * added htmlspecialchars as a filter to the text that is displayed in the title and meta - anything else needed  to prevent malicious people? I think no. (If you are an English speaker you may want to use the htmlentities PHP function, which is more restrictive.)
 * v0.1.0
 * Initial version - everything works.