Fix nick changes not being properly reported in the logs

Before:

```
[2016-10-10 15:17:47] *  nick
```

After:

```
[2016-10-10 16:32:47] * astorije nick astorije2
```

client/views/actions/nick.tpl

@@ -1,3 +1,3 @@
-<span role="button" class="user {{colorClass nick}}" data-name="{{nick}}">{{mode}}{{nick}}</span>
+<span role="button" class="user {{colorClass from}}" data-name="{{from}}">{{mode}}{{from}}</span>
 is now known as
 <span role="button" class="user {{colorClass new_nick}}" data-name="{{new_nick}}">{{mode}}{{new_nick}}</span>

src/plugins/irc-events/nick.js

@@ -36,9 +36,9 @@ module.exports = function(irc, network) {
 			});
 			msg = new Msg({
 				time: data.time,
+				from: data.nick,
 				type: Msg.Type.NICK,
 				mode: chan.getMode(data.new_nick),
-				nick: data.nick,
 				new_nick: data.new_nick,
 				self: self
 			});

src/userLog.js

@@ -37,7 +37,9 @@ module.exports.write = function(user, network, chan, msg) {
 
 		line += msg.type;
 
-		if (msg.text) {
+		if (msg.new_nick) { // `/nick <new_nick>`
+			line += ` ${msg.new_nick}`;
+		} else if (msg.text) {
 			line += ` ${msg.text}`;
 		}
 	}