Fix voice states being overwritten after a GUILD_SYNC.

This was a two-fold problem. The first of which involved the overwriting
of members during a GUILD_SYNC. Since we are requesting a chunk anyway,
we have all the member references we need without actually chunking. The
second problem came from the order. We were doing a GUILD_SYNC and then
doing the chunking requests. We should do the GUILD_SYNC after the
chunking in order to just update presences.

discord/server.py

@@ -180,6 +180,19 @@ class Server(Hashable):
         self.unavailable = guild.get('unavailable', False)
         self.id = guild['id']
         self.roles = [Role(server=self, **r) for r in guild.get('roles', [])]
+
+        for mdata in guild.get('members', []):
+            roles = [self.default_role]
+            for role_id in mdata['roles']:
+                role = utils.find(lambda r: r.id == role_id, self.roles)
+                if role is not None:
+                    roles.append(role)
+
+            mdata['roles'] = roles
+            member = Member(**mdata)
+            member.server = self
+            self._add_member(member)
+
         self._sync(guild)
         self.large = None if member_count is None else self._member_count > 250
 
@@ -197,18 +210,6 @@ class Server(Hashable):
         if 'large' in data:
             self.large = data['large']
 
-        for mdata in data.get('members', []):
-            roles = [self.default_role]
-            for role_id in mdata['roles']:
-                role = utils.find(lambda r: r.id == role_id, self.roles)
-                if role is not None:
-                    roles.append(role)
-
-            mdata['roles'] = roles
-            member = Member(**mdata)
-            member.server = self
-            self._add_member(member)
-
         for presence in data.get('presences', []):
             user_id = presence['user']['id']
             member = self.get_member(user_id)