changed show-associations animation timeout
proper "khan" spelling in hebrew
bug fix on using embedding topic.id
new homepage
Revert "new homepage"

This reverts commit e180e269de7cad6244647740e421d35da0c80fca.
Revert to show exercises link
Reinstated new homepage
removed 'related exercise' support in main catalog
track exercise progress in user-css
logging update
remove deprecated cron jobs
bug fix in map reduce calls
Update user exercise progress to usercss