Support the 'Any' protobuf type from an external grpc-gateway process

This is just a quick one.

I had some trouble making the Any protobuf type work when running grpc-gateway from a separate process with the gateway throwing an unknown message type error. A quick fix for this is to import the generated pb.go file to your proxy source. Something like:

package main

import (
    ...

    _ "github.com/username/pkgwithpbgo"
)
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