(WIP) WL-98 As a course instructor, auto-register (as well as auto enroll) a list of students into my course

@chrisndodge here are the changes related to WL-98 for your quick reivew. 
we have written the test cases but only one coverage is missing in our code.  
currently we did not check/test the code for quality.

In order to test this feature you need to set the flag: 
FEATURES['ALLOW_AUTOMATED_SIGNEDUPS'] = True
You will need Jasmine tests to cover this code. Writing the code using Backbone views and models would make this easier. Also, there is a notifications framework that you can reuse. It supports lists of errors.

/devstack2/edx-platform/lms/static/js/views/notification.js