Add all default numeric answers from default survey to "ratings" array.

[hbarrett]

For the /api/submit_survey route add all numeric answers from the default survey to the "ratings" array in the learning resource for that survey.

[hbarrett]

The value written to the "ratings" array will be an average of all answers to a single response. For example if there were 2 responses, then the "ratings" array might look like this: [2.3,3.4]