In theory, version exchange for client and server works now.

Test rig isn't there yet, so untested at the moment.

Added a simple README

README

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+For now: See doc/AIMS
+
+Currently, nothing is interesting. 
+
+Here's a general idea of the order in which i'm going to be implementing things.
+Note that nothing is set in stone here. Also, parallelism is to be expected as
+I get bored of one thing and so start on another.
+
+  * Basic em-bitcoin functionality, dragging along btc_wire_proto as I go
+    - Build the full block chain from scratch
+    - Be able to send transactions to others
+    - Wallets
+  * HTTP interface for wallets, users
+    - Client-side transaction signing
+  * Bitcoin RPC interface for interop with existing management tools
+  * Simple market for registered users
+    - Multiple currency support (GBP to start, then euro, then dollar)
+    - Integration for various put-cash-into-the-market services (wire transfer, to start)
+
+Once those bits are in, polish them 'till they gleam. Then start on the other bits.