[Rprotobuf-yada] Descriptor $ extration

[Romain François]

Hi,

Now when you create a message Descriptor (google::protobuf::Descriptor), 
for example using the P function, you can use dollar extraction to grab 
either field descriptors of its fields or Descriptors of its inner types:


# scan the person.proto file and bring back a descriptor for the
# message type tutorial.Person
Person <- P( "tutorial.Person", file = "/tmp/person.proto" )

# grab the inner type tutorial.Person.PhoneNumber
Person$PhoneNumber

# grab the field descriptor for the "email" field of the
# Person message type
Person$email

Romain

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Romain Francois
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