Batch events

It's now a Tick that locks down event order. Before this change, the
event order would be locked down in the order the server sees it.

Fixes #59
Fixes #61

src/bin/genesis-demo.rs

@@ -4,7 +4,7 @@ extern crate silk;
 use silk::mint::Mint;
 use silk::event::Event;
 use silk::transaction::Transaction;
-use silk::log::create_entries;
+use silk::entry::create_entry;
 use silk::signature::{KeyPair, KeyPairUtil, PublicKey};
 use silk::hash::Hash;
 use std::io::stdin;
@@ -14,17 +14,17 @@ fn transfer(from: &KeyPair, (to, tokens): (PublicKey, i64), last_id: Hash) -> Ev
 }
 
 fn main() {
-    let alice = (KeyPair::new().pubkey(), 200);
-    let bob = (KeyPair::new().pubkey(), 100);
-
     let mint: Mint = serde_json::from_reader(stdin()).unwrap();
+    let mut entries = mint.create_entries();
+
     let from = mint.keypair();
     let seed = mint.seed();
-    let mut events = mint.create_events();
-    events.push(transfer(&from, alice, seed));
-    events.push(transfer(&from, bob, seed));
+    let alice = (KeyPair::new().pubkey(), 200);
+    let bob = (KeyPair::new().pubkey(), 100);
+    let events = vec![transfer(&from, alice, seed), transfer(&from, bob, seed)];
+    entries.push(create_entry(&seed, 0, events));
 
-    for entry in create_entries(&seed, events) {
+    for entry in entries {
         println!("{}", serde_json::to_string(&entry).unwrap());
     }
 }