presentation changes and images
specify the conference
more readable links
Opencast Unconference 2014 slides
Add info on the success rate
edit challenges
add more future plans
fix typo
slides for the LTI talk
remove the source code link
slides correction and normalization slides
add link for audio normalization
Fix conflict
title page
Intro slides
images and first slides
fix section
more slides
fix monitoring slides
fix monitoring again