* Remove $wg*Selenium* globals as they are only used for testing.

* Remove $wg*Selenium* globals as they are only used for testing.
* mglaser said the SpecialSelenium page wasn't needed so I'm removing it – I suggest its functionality be put in an extension if needed.
* Add verbose option (requires patch to Testing_Selenium) to RunSeleniumTests.
* TODO: add .ini file to hold local configuration
* TODO: add ability to sniff available browsers from Grid server instead of hard-coding.