Bok-choy

* Fix a bug in the packaging of the accessibility JS file
* Documentation improvements

* Implement visual diff testing with Needle
* Implement a11y testing with PhantomJS and Google Chrome Accessibility Developer Tools
* Small clarity edits for the tutorial
* Fix all pylint errors and enable linting in CI

* URLs can contain basic auth credentials
* Small bug fixes

* Changed license from AGPL to Apache
* Unpinned selenium version
* Bypass the security prompt when accessing a media device in FF
* Support faking media device access in Chrome
* Small bug fixes and improvements

* Update selenium version to 2.42.1
* Save selenium driver logs on error
* Add capability for capturing HAR files of network traffic
* Do not take auto screenshots for skipped tests
* Add timeout in wait helpers
* Small bug fixes

* Added docs for test-writing guidelines.
* Unguard q method
* Add a test with an example of a filtered query on a page
* Add a test with an even more complex selector method as a good example
* Add wait for ajax command to page object
* When visiting a page, give it some time to get there
* Minor improvements to Bok Choy failure messages
* Added test for timeout on PageObject visit method
* Extended the lines of code to show for round 3 of the search results
* Fix all function issue
* Wait Helpers for PageObject
* Adjusted .sh script for killing child processes.