Merge pull request #36 from iglesias/master

Add Gunnar's slides from workshop 2013
add json callbacks /notebook/list and /notebook/thumbnail/<num>/ to fetch notebook list and get images
use binary rendered images / links on homepage to reduce its size
add forgotten file
allow CORS
fix typo
export ipynb and img url via json
fix another typo
display full url / foo
add missing '"'
add path to shogun sources`
Add pyc files to gitignore