Upgrade testing framework to Selenium 2

In preparation for Ideation; we are merging New Feature and Improvement tickets into a singular ticket type called “Feature Request”.

This ticket has been converted to story ticket type for you; so that the ticket may continue to progress through the workflow properly.

However these tickets were not writing in the proper story format. Please format this ticket to story standards.

This ticket was completed a long time ago (for the task of integrating Webdriver into source), sorry for the delay in requesting a review!

Code already in master (https://github.com/liferay/liferay-portal/tree/128258bb9bebe1a9b257603ba77cec4f582f1f73). Sending to PM Review.