Add an initial Substrate instantiation

Consensus has been nuked for an AcceptAny currently routed throough PoW 
(when it doesn't have to be, doing so just took care of a few pieces of 
leg work).

Updates AGPL handling.

substrate/node/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod chain_spec;
+pub mod rpc;
+pub mod service;