await event handling result in Bounty test. Fixes #202

test/Bounty.js

@@ -52,7 +52,7 @@ contract('Bounty', function(accounts) {
       let bounty = await SecureTargetBounty.new();
       let event = bounty.TargetCreated({});
 
-      event.watch(async function(err, result) {
+      let watcher = async function(err, result) {
         event.stopWatching();
         if (err) { throw err; }
 
@@ -77,8 +77,9 @@ contract('Bounty', function(accounts) {
           assert.equal(reward,
             web3.eth.getBalance(bounty.address).toNumber());
         }
-      });
+      };
       bounty.createTarget({from:researcher});
+      await awaitEvent(event, watcher);
     });
   });