Multiple parallel tests support

[foal]

I tried to use Selenium Client Factory library to run parallel tests on bamboo, with multiple selected browsers. Generally it works, but...

There are two main issue:

1. No authentication if I try to use JSON configuration in url field.
2. No direct methods to parse and use that configuration. I will need to copy/paste necessary methods to my base test class

The result is on https://bitbucket.org/foal/open-gxt-test (base module)