Fixing MySQL GROUP_CONCAT() Issues

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Updated Test Dependencies

The group_concat_max_len value needs to be increased for some courses. This value is specific to MySQL (as opposed to SQLite run locally), so the DB vendor must be compared to ensure the new code only runs for MySQL databases.

updating nr

Optimized Courses Problems Endpoint

Using raw SQL to retrieve and aggregate the data. This significantly decreases response time. Also added a created field so that users know when the data was last updated.

answer_value should be used instead of answer_value_text and answer_value_numeric

Consolidation parameter for extraneous variants

Problem answer distribution will only return the answer_value.

Finished test cases for answer consolidation within the API

Fixed parameter conversion to boolean

Make consolidate parameter case-insensitive

Increase verbosity of parameter name

ConsolidatedAnswerDistributionSerializer now a subclass of ProblemResponseAnswerDistributionSerializer

Implemented changes suggested in comments on open PR

Minor pep8 violation fixed

Responded to jbau's latest PR comment

Re-added missing import statement

Removed GET parameter for consolidation in favor of mandatory use, updated test cases

Moved non-consolidation logic out of initial loop to avoid returning partial set of data

Added Endpoint for Course Problems

This replaces the submission counts endpoint.

Added Endpoint to Get Submission Counts for Multiple Problems

Added fields and edx demo to answer distribution fixtures.

test_views was too big.

Alpha Data API Documentation

Added problem_display_name and question_text fields to answer distribution.

Added BaseDistributionSerializer to standardize formatting of "created" field.

Added missing forward slash to API endpoints

Replaced iso3166 with django-countries

This change ensures the country names in the CSVs match those displayed in Insights.

Upgraded to Django 1.7

Merging Audit and Honor Enrollment Modes

The audit and honor enrollment modes are now combined into honor.

Updated Demographics and Enrollment Mode Serializers with Defaults

Both serializers will not return 0 if a demographic or mode field value is set to None.