Merge pull request #96 from aboudreault/ooyala-hash-update

Ooyala hash update
mattdrayer/api-gradingpolicy: Grading policy now returned when retrieving a users course grades
Updated group project XBlock hash:
Merge pull request #97 from edx-solutions/mattdrayer/api-gradingpolicy

Mattdrayer/api gradingpolicy
add social metrics to the comment client

add some better error handling

switch over
Merge pull request #91 from edx-solutions/cdodge/add-social-stats

Cdodge/add social stats