EDX-469: Make it possible for only admin user to handle personal information in instructor dashboard.
EDX-504 FIX .email-settings #receive_emails FLG
Merge pull request #137 from yokose-ks/EDX-469

EDX-469: Make it possible for only admin user to handle personal informa...
Merge pull request #138 from WatanabeYasumasa/gacco2/master

EDX-504 FIX .email-settings #receive_emails FLG
EDX-501: Make it possible for only admin user to see the link of old dashboard.
Merge pull request #139 from yokose-ks/EDX-501

EDX-501: Make it possible for only admin user to see the link of old das...
EDX-423: Add install settings for PollXBlock