Create API Endpoint to ingest and validate data from 3rd party sources.

[seanedwards]

This will require some kind of external "Partner ID" field for some tables:

• Legislators

• Issues

• Users (?)

• [ ] Create JSON schema for a "stance report" data point

• [ ] Create an API POST endpoint to receive a list of stance reports

• [ ] API endpoint validates the schemas of stance reports

• [ ] API endpoint posts stance reports to keen.io