Figure out packaging for language-specific gRPC libs

[Roasbeef]

gRPC allows us to easily create fully complete libraries within the list of supported languages using the protoc compilation tool. Currently the compiled protos for Go reside within the lnrpc package. After the beta release, we should provide pre-compiled code for various other languages in order allow developers to easily start to experiment/develop against the API without having to install protoc and compile the stubs for their language by hand.

I propose we make another repository outside of this one (but within the organization) which will house the pre-compiled language stubs (client only however).

[Roasbeef]

We've opted just to provide details installation instructions for certain popular languages. These instructions can be found in this directory.