Add bucket property and test on metadata
Add try/finally to streams.
Initial App Identity tests.
Fix code style.
Remove isRuntimeDev / isRuntimeProd, make execution generic.
Fix modules.html and README -- adding AppIdentity and Prospective Search.
Add missing services to deployment.
Appspot does not throw an exception to not break existing applications.  SDK throws exception as expected.
Skip some Appspot tests.