fix AE doc
add ROUTER_IP to forward streams
add context_processors.hosts in order to parse media urls with HOST
fix host
add print
fix ip
set all MEDIA_URL with set_host
fix snapshot url
fix context localhost, audio url
Merge branch 'dev' of git+ssh://vcs.parisson.com/var/git/teleforma into dev

Conflicts:
	teleforma/context_processors.py
update chk_media to trim the video. require python-ebml
partially fixed mp3 fixed before webm
fix mp3 check and transcode AFTER fixing webm
fix media check
re-add host context processor
fix media remux : ffmpeg -ss in seconds with python-ebml 0.2
Merge branch 'dev' of git+ssh://vcs.parisson.com/var/git/teleforma into dev
update tools/trans/fix_chk_media.py from relay
begin course revisions
Merge branch 'dev'