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delete khan-exercises directory and changes the path of the 'khan-exercises' to 'perseus/ke' static path.
Merge pull request #2779 from mrpau/hotfix/2524-Delete-khan-exercises-folder-since-we're-using-the-one-within-the-perseus-folder

Delete khan-exercises folder, since we're using the one within the perseus folder
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Merge pull request #2783 from 66eli77/timeline-report

#2704: Timeline report
update youtube_dl to 2014.12.10.3 release
Merge pull request #2785 from aronasorman/2777/youtube_dl_not_working

#2777: update youtube_dl to 2014.12.10.3 release