Cleaned up messages, spec changes

The protocol changed a bit, I forgot to add room ids for some of the
messages. Other big features are that there are now ways to process
messages built into the library itself. Signature verification is
stubbed out because its a low priority feature, but encoding it in the
lib gives a standardized way to do it

src/state.rs

@@ -33,5 +33,5 @@ pub enum StatePermissionValue {
 #[derive(Serialize,Deserialize,Clone,Debug)]
 pub struct StatePermission(StatePermissionKey,StatePermissionValue);
 
-#[derive(Serialize,Deserialize,Clone,Debug)]
+#[derive(Serialize,Deserialize,Clone,Debug,Hash,PartialEq,Eq)]
 pub struct StatePath(Vec<String>);