<Array> getResultsPerSource()
Returns an array of results for all sources.
array
[{ source: "regular", voters: 2, results: [{ votes: 1, percentage: 50 }, { votes: 1, percentage: 50 }] }, { source: "facebook", voters: 4, results: [{ votes: 1, percentage: 33 }, { votes: 2, percentage: 67 }] }]