Chromium package in Contrib

Thanks to unceasing endeavors of David Buck and Raymond Wooninck we now have Chromium built fully from the source code!

It is available from our Contrib repository (package chromium). I recommend using this one instead of various other RPMs that repack Google Chrome/Chromium binaries or are kept in users home repositories. Big thanks also goes to Tom ‘spot’ Callaway for much of the original patchwork, Justin Haygood for helping with the icu patch and Malcolm Lewis.