ECOM-248 Course Info API. Basic functionality implemented.

ECOM-248 adding factory for about descriptor and test cases for course info api

ECOM-248 adding test cases for couse info api.

ECOM-248 re-factoring code. updating test cases.

Tests for course_about data module

ECOM-248 Adding test cases for the exceptions.

ECOM-248 re-factoring code. fixing quality issues.

ECOM-248 fixing test cases and moved parse video method into utils.

added github username in authors

ECOM-248 removed merging issue of test_data

ECOM-248 removed unused files