Add some light docs, rm empty walletinterface (better as events)

src/chain/chaininterface.rs

@@ -7,6 +7,9 @@ use std::sync::{Weak,Mutex};
 
 /// An interface to request notification of certain scripts as they appear the
 /// chain.
+/// Note that all of the functions implemented here *must* be reentrant-safe (obviously - they're
+/// called from inside the library in response to ChainListener events, P2P events, or timer
+/// events).
 pub trait ChainWatchInterface: Sync + Send {
 	/// Provides a scriptPubKey which much be watched for.
 	fn install_watch_script(&self, script_pub_key: Script);
@@ -45,6 +48,11 @@ pub enum ConfirmationTarget {
 	HighPriority,
 }
 
+/// A trait which should be implemented to provide feerate information on a number of time
+/// horizons.
+/// Note that all of the functions implemented here *must* be reentrant-safe (obviously - they're
+/// called from inside the library in response to ChainListener events, P2P events, or timer
+/// events).
 pub trait FeeEstimator: Sync + Send {
 	fn get_est_sat_per_vbyte(&self, ConfirmationTarget) -> u64;
 }

src/lib.rs

@@ -7,6 +7,5 @@ extern crate crypto;
 extern crate num; //TODO: Convince andrew to not rely on this for fucking casting...
 
 pub mod chain;
-pub mod wallet;
 pub mod ln;
 pub mod util;

src/wallet/mod.rs

@@ -1 +0,0 @@
-pub mod walletinterface;

src/wallet/walletinterface.rs

@@ -1 +0,0 @@
-