[Rprotobuf-yada] asMessage

[Romain François]

Hi,

For convenience, I have added the asMessage function as a shorthand for 
as( ., "protobufMessage" )

There are a few methods implemented, for example to coerce a message 
descriptor to a message (of type google.protobuf.DescriptorProto) :

 > asMessage( tutorial.Person )

Romain

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Romain Francois
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