[Caja] Concrete proposal for changing loadModule() and cajoling service API

[ihab . awad]

http://docs.google.com/Doc?docid=0AVWyIFBvIVXGZGZneGI3Z2tfNjVkbjV0OXdmaw&hl=en
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Ihab A.B. Awad, Palo Alto, CA