additional SPEC and updated ffmpeg+x264 sources

Hi Lars,

Are you by chance adding things to your RPM/SRPM repository but not updating Github?  In this pull request I've updated the tutorial to reflect the process I followed on RHEL 6.3, also added some spec files pulled via your python script but not in this github repo, updated the sources for x264 and ffmpeg1.0 with a minor change in the x264 configure process.

Let me know if need to clean any of these commits up but they are working for me :+1: