Merge pull request #1 from nettoyeur/master

Fix indexing + support multiple EdX powered sites
Add log when getting course chapters.
Add download selection to courses and chapters courses.
Add --interactive mode.
Some refactor to detect --interactive mode.
Removed youtube_dl folder in favor of external youtube_dl dependency
Added requirements.txt
Merge branch 'master' of git://github.com/ojacquemart/edu_10gen_dl into ojacquemart-master
Fixes for ojacquemart's pull request.
Refactoring.
Switch to EdX names.
Readme update. Rename to edx_dl.py
Added source coding (PEP-0263)
Some refactoring + fix for edx.org login.
Merge branch 'master' of https://github.com/nonsleepr/edu_10gen_dl
Merge https://github.com/nonsleepr/edu_10gen_dl