Merge pull request #92 from gergnz/master

Add 2 more talks
boundary - austin sponsor
stackdriver sponsor austin
Silver sponsor get pitch too in London
New talk by Francesco Vollero proposed
Merge pull request #93 from drozer/master

new talk proposed Francesco Vollero
better do it right the first time.
Merge pull request #94 from drozer/master

biography on wrong section
updated stackdriver logo
Add Alex Papadimoulis proposal for Berlin 2013.
Merge pull request #95 from jbraeuer/master

Add proposal: Alex Papadimoulis.
add puppetlabs as a sponsort
add Matt Moor as an organiser