list media sources in more than one of tweet-based partisanship collections

[rahulbot]

While doing a demo I used the "Compare Across Partisanship" feature and noted that some of the sample stories shown in two collections were both from time.com. Those collections shouldn't overlap at all. The task here is to use the API to pull the list of sources in each of the collecitons and generate a list of sources that appear in more than one, and which they appear in. That list then be used the manually decide in which they actually belong.

The collection IDs being used are [231013063, 231013089, 231013108, 231013109, 231013110].