Add deprecation warning for old code untested since 2014.
Add deprecation warning for old code untested since 2014.

mdmintz/seleniumspot,seleniumbase/SeleniumBase,mdmintz/SeleniumBase,mdmintz/SeleniumBase,seleniumbase/SeleniumBase,mdmintz/seleniumspot,mdmintz/SeleniumBase,seleniumbase/SeleniumBase,seleniumbase/SeleniumBase,mdmintz/SeleniumBase