Add version check
Add version check

GoogleLogin v2.x requires MediaWiki 1.24, add a check for this.

Change-Id: I6e65a7e69bcf8b7cc1db9f8023fd4418071f6e07

tamcap/mediawiki-extensions-GoogleLogin,wikimedia/mediawiki-extensions-GoogleLogin,tamcap/mediawiki-extensions-GoogleLogin,wikimedia/mediawiki-extensions-GoogleLogin