Factored Narya into two Maven modules: core and tools.

This will allow us to properly ship narya-tools.jar to Maven Central which is
necessary for Nenya and Vilya (and any other Narya-using project) to themselves
be built.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6776 542714f4-19e9-0310-aa3c-eee0fc999fb1

core/src/cpp/presents/DisconnectReason.h

@@ -0,0 +1,13 @@
+#pragma once
+
+namespace presents 
+{    enum DisconnectReason {
+        NETWORK_DISCONNECT,
+        SERVER_DISCONNECT,
+        CLIENT_CLOSED,
+        SERVER_UNREACHABLE,
+        UNKNOWN
+    };
+    
+    typedef boost::signal<void (DisconnectReason)> DisconnectEvent;
+}