Service methods should be able to declare content-type for input

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Currently, input to service methods (message body of PUT or POST) is always just seen as a string and passed as such to service methods. Service methods need to be able to specify a desired content type and Glu should interpret the input then accordingly.

For example, if a service method defines "application/json" then Glu should attempt to parse the input buffer as JSON and pass the proper object as input, not a string.