SConfig has it's own 'factory method'.

I didn't like the fact that SPageConfig was the
only way to grab one.

Other areas of the code should be able to grab an
instance of SConfig without having to rely on the
SPageConfig.
SPageFactory now relies on SConfig.getConfig().
Updating tests to adapt to the new nature of SConfig
Added support for "selenium hub" option in SWebDriverFactory.

Of course, tests stress this new functionality.
Adding 'CHANGELOG' file.