stuff for ~/bin

contains code from third-parties:

 * pdf2png http://bruxy.regnet.cz/
 * ratcpi https://github.com/jbaber/ratpoison_scripts
 * stopwatch http://www.thelinuxdaily.com/2012/03/simple-stopwatch-script/
 * strip-tags http://savvyadmin.com/strip-all-unwanted-mp3-id3-tags/
 * thinkwatt https://github.com/mikar/thinkwatt
 * xfs-raid http://www.mythtv.org/wiki/Optimizing_Performance#Optimizing_XFS_on_RAID_Arrays