new thumbnails

for mining the social web and Jose Unpingco Python for signal
processing.
link IRuby
remove some examples change IPtyhon thumb
add donation link
new thumbnail for prob programming
Bayesian programming third is prettier
Improvement to faq:

TOC on FAQ, each header has anchor, each header is a link to himself
use headroom to remove header on scroll
add headroomjs
add font awesome
add anmate.css
stick bar on top on mobiles + option for MockCache
add fontawesome link and localfilehandler
no need to fade bar anymore
accept seding content as gzip