XBMC Forum - New Dark Theme

Just a standard theme to match the main XBMC website. I have deliberately made no changes to it so we can easily upgrade MyBB versions hopefully. Its matches our main website pretty well already. Originally downloaded from here:
http://mods.mybb.com/download/apart-1

I suggest we just add it as a 2nd option for now to see how it goes with a few users. No need to make it default. The install file is in a folder called images/1/install as I didnt know where else to put it.

At the moment the theme is a little gray for my liking. I added some coloured forum icons for the future but this will require a 2nd PR to use.

You can test the new theme live on my test web server here for the completed look:

http://81.144.164.217/forum or a preview JPG here: http://www.theaudiodb.com/images/_extra/forum_preview.png