add version for selenium webdriver
remove @current tag not in use.
refs #1279 use label_revision to find changeset in languages other than English.
refs #1302 remove current tag
fixes #1302 organize scenario using scenario outline
refs #1305 capybara version is not same between Redmine2.3.x and Redmine2.4.x
refs #1305 resolve conflict version of selenium-webdriver