Merge pull request #109 from nttks-dais/gacco2/master

Fix fd limits and error handling of delete.
EDX-378: Fix parameters of YOUTUBE.TEXT_API.lang to get transcripts from YouTube
Merge pull request #110 from yokose-ks/EDX-378

EDX-378: Fix parameters of YOUTUBE.TEXT_API.lang to get transcripts from...
Fix email-settings in dashboard.
Merge pull request #111 from WatanabeYasumasa/gacco2/master

UPDATE email-settings in Dashboard
EDX-414: Change csv module to unicodecsv module.