Add debugger_address option to the ChromeDriver options list to optionally instruct ChromeDriver to wait for the target devtools instance to be started at a given host:ip

Signed-off-by: AutomatedTester <dburns@mozilla.com>
Update Closure library and compiler.

Library to 5fbc334ce7f86018da9fb5e673d2518143aa999e
Compiler to release v20141120
WebElement docstring fixes

Signed-off-by: Andreas Tolfsen <ato@mozilla.com>
Add Timeout option to FirefoxProfile to enable custom browser launch timeout (45 seconds on old machines could not be enough)