Added new permissions system, fixed more commands and module bugs.

src/Discord.Net.Modules/ModuleChecker.cs

@@ -0,0 +1,20 @@
+using Discord.Commands;
+using Discord.Commands.Permissions;
+
+namespace Discord.Modules
+{
+	public class ModuleChecker : IPermissionChecker
+	{
+		private readonly ModuleManager _manager;
+
+		internal ModuleChecker(ModuleManager manager)
+		{
+			_manager = manager;
+		}
+
+		public bool CanRun(Command command, User user, Channel channel)
+		{
+			return _manager.FilterType.HasFlag(FilterType.Unrestricted) || _manager.HasChannel(channel);
+		}
+	}
+}