ME: added 'metadata' fields to user profile model and serializer
ME: added tests to check if profiles have metadata attribute
ME: added metadata fields to the model and the serializer
ME: added a migration file to update the user profile model
ME: added metadata field to user_profile_data return value
ME: refactored test_project_get_starred_by test
ME: fixed failing tests by refactoring code
ME: refactored 'retrieve' method to include 'export_handler'
ME: added list action
ME: added a test for data endpoint xls export
ME: added ability to access list action without 'pk' or when pk is 'public'
ME: replaced 'export_handler' with 'custom_response_handler'
ME: code refactor; created a separate function to handle logs
ME: refactored 'retrieve' method to include 'export_handler'
ME: added list action
ME: replaced 'export_handler' with 'custom_response_handler'
ME: code refactor; created a separate function to handle logs
ME: rendering json and xml formats only for data instance
ME: removed xml response for now
ME: refactored 'retrieve' action