Improved .shardstats format + small cleanup

src/NadekoBot/Services/ICoordinator.cs

@@ -8,15 +8,15 @@ namespace NadekoBot.Services
         bool RestartBot();
         void Die();
         bool RestartShard(int shardId);
-        IEnumerable<ShardStatus> GetAllShardStatuses();
+        IList<ShardStatus> GetAllShardStatuses();
         int GetGuildCount();
     }
     
     public class ShardStatus
     {
         public Discord.ConnectionState ConnectionState { get; set; }
-        public DateTime Time { get; set; }
+        public DateTime LastUpdate { get; set; }
         public int ShardId { get; set; }
-        public int Guilds { get; set; }
+        public int GuildCount { get; set; }
     }
 }