Add command for syncing the list of students in a course with a mailchimp list
Send mailchimp updates in batches of fixed sizes
Do not synchronize grades to mailchimp for now
Unsubscribe from mailchimp students who are no longer enrolled on a class
Verify that FULLNAME is part of the list tags
Fix error when checking if template tag FULLNAME is present
Add course id log when synchronizing to mailchimp
Add student unique id field to mailchimp tables
Use students.models.unique_id_for_user instead of custom hash
Fix incomplete results when retrieving list members

Also speedup queries significantly
Rename mailchimp sync script
Add command to get the mailchimp api id of list using its web_id
Added functionality to split each list into static segments

Also only subscribe people who are not already subscribed
Add mailchimp command to synchronized lists of enrolled students
Change UNIQUE_ID to EDX_ID to avoid conflicts with mailchimp
Fix error that tries to recreate a mail tag already created
Update get course students