Provide event for receipt of remote media.

[josephfrazier]

See #15 (comment) for the reasoning behind this.

[wakamoleguy]

This is part of a larger project of adding media events. Let's take this to the mailing list and have the discussion there. We can discuss outside of the issues tracker and then bring it back here once we have decided (or mostly decided) on the full set of events and their behavior.