[#50300875] click_no_wait compatible with webdriver
[#49213693], [#48880259] conflicting browser and watir/webdriver choices handled gracefully
[#52026967] handle safari driver exception 'does not interact with modal dialogs' gracefully
[#50766197] use visible? instead of enabled? in wait methods when using webdriver
[#52089787] fix gemspecs to handle nokogiri (ruby 1.8.7 vs 1.9) and mini_magick (syntax error in gem)