Deleting the unused version of SeleniumCommandTimedOutException.
Start migrating classes from an internal package to com.thoughtworks.selenium.webdriven

The idea is to try and make the eventual hiving off of the legacy RC package in
Selenium 3.0 a simpler proposition.
Move the ElementFinder and JavascriptLibrary into com.thoughtworks.selenium.webdriven
Move the ScriptMutator and implementations to com.thoughtworks.selenium.webdriven
Move the emulated selenium commands to com.thoughtworks.selenium.webdriven.commands