Stub out the remainder of the Capybara::Driver::Base API that will likely access Selenium
Stub out the remainder of the Capybara::Driver::Base API that will likely access Selenium

This might not be the comprehensive list, but it covers the APIs that are
covered by the Capybara::Driver::Selenium class

Fixes #67

saucelabs/sauce_ruby,angelabier1/sauce_ruby,angelabier1/sauce_ruby,saucelabs/sauce_ruby,anthonywoo/sauce_ruby,DylanLacey/sauce_ruby,bootstraponline/sauce_ruby,bootstraponline/sauce_ruby,anthonywoo/sauce_ruby,bootstraponline/sauce_ruby,angelabier1/sauce_ruby,bootstraponline/sauce_ruby,angelabier1/sauce_ruby,DylanLacey/sauce_ruby