Add support for patching Radio

Now that we're patching Backbone.Wreqr to power the radio pane, we've got to support Backbone.Radio or risk infuriating the true believers who've seen the radio light.

@dnewkerk rock n' rolled last night and added `patchBackboneRadio` and `serializeRadioChannel`. I came in this morning and *disambiguated* the method names so they didn't collide.