Drop ugly 4px border around images

Visually distracting and serves no real purpose.
Add overview of SUSE Cloud
Add shellinabox startup script and CSS

Connect to a screen sesssion with "screen -xR" from shellinaboxd.
Scale images and iframes to full slide size
Reduce shellinabox font size by 2pt, increase line spacing a bit
Merge branch 'master' into gh-pages