Selenium

* handle potential URLError from sending shutdown, set self.process to None after it's already been quit
* Add support for submit() with W3C compliant endpoint

* Ensure you can close stream before attempting to close it.
* message response may cause json loads ValueError when it's not actually json
and just a string (like the message that occurs when firefox driver thinks
another element will receive the click)
* Cleanup some error handling when sniffing what protocol you are speaking

* Have Firefox service write to a file instead of PIPE
* on osx for firefox, fallback to checking homebrew install, if the default isn't there
* Added Firefox path variable for string placeholder
* Update README to show Python 3.2+
* refactoring all the service classes to use a common one.
* Add Firefox specific command to switch context between Browser content and Browser chrome
* updating files after go copyright:update
* Use specificationLevel to know that we are speaking GeckoDriver
* Bug fixes: 1294, 1186

* Update error pulling to match spec when we encounter a spec compliant browser.
* Disable tests that are not working with Marionette when running Marionette tests
* Add the ability to run python marionette tests
* Python 3 compatibility for remote Authorization
* changing casing of children finding tests

* Bring back py 3 support

* Fix running Edge driver locally on win10
* adding repr to WebDriver and WebElement