Update video_cache_add to check_videos_in_cache
This commit changes the video_cache_add function in wiki.py from calling the (now deprecated) videocacheadd hook in the mediawiki extension, to calling the new videocacheinfo hook which simply returns if for a given url, we have that value present in the videocache. This follows the move to having videos now be downloaded locally by the developer and uploaded to torque servers.
Issue #170 (closed) Update Video Cache function in wiki.py to uploading protocol
Closes #170 (closed)