stats.py added course/prof ratings count histogram and individual rating histogram
stats.py added course/prof ratings count histogram and individual rating histogram

duaayousif/rmc,rageandqq/rmc,shakilkanji/rmc,sachdevs/rmc,sachdevs/rmc,shakilkanji/rmc,duaayousif/rmc,MichalKononenko/rmc,duaayousif/rmc,ccqi/rmc,rageandqq/rmc,rageandqq/rmc,ccqi/rmc,duaayousif/rmc,MichalKononenko/rmc,rageandqq/rmc,JGulbronson/rmc,JGulbronson/rmc,JGulbronson/rmc,sachdevs/rmc,ccqi/rmc,shakilkanji/rmc,MichalKononenko/rmc,UWFlow/rmc,JGulbronson/rmc,UWFlow/rmc,shakilkanji/rmc,ccqi/rmc,MichalKononenko/rmc,shakilkanji/rmc,UWFlow/rmc,duaayousif/rmc,sachdevs/rmc,JGulbronson/rmc,ccqi/rmc,UWFlow/rmc,sachdevs/rmc,rageandqq/rmc,UWFlow/rmc,MichalKononenko/rmc