Feature bundle

[AndrewFinlay]

Hi there,

I've put together a bunch of changes that you might be interested in. If you need I can separate these and repackage them.

Anyway this introduces new features:

• user specified css files
• a report title option
• pass fail summary at the top of the report
• quick links to failed tests at the top of the report
• a settings summary at the end

Changes and fixes include:

• using 'rimraf' to empty the output directory
• using the spec description rather than full name for cleaner presentation
• reinstating the old promise resolved browser caps that is used by the pathBuilder.

[mlison]

Hey @AndrewFinlay, great work!

_{... and my apologies for taking so long to check this out.}