#46: student progress tooltip changed to hebrew
added my gae sdk dir to .gitignore
Fix cache key generation for topic.get_filled_content_topics
#49: sort vids and exercises for display in progress report
#38: sort exercises and show only relevant in class profile
#37: browse to user profile upon clicking on chart column
bug fix in exercise selection in exercise over time graph
show exercise hebrew name
#47: allow filtering by topic in class progress report
#47: topics are clickable for quick filtering
added *.orig to .gitignore