Added rudimentary voice joining

lib/Client/Resolver/Resolver.js

@@ -116,6 +116,14 @@ var Resolver = (function () {
 		return found;
 	};
 
+	Resolver.prototype.resolveVoiceChannel = function resolveVoiceChannel(resource) {
+		// resolveChannel will also work but this is more apt
+		if (resource instanceof VoiceChannel) {
+			return resource;
+		}
+		return null;
+	};
+
 	Resolver.prototype.resolveChannel = function resolveChannel(resource) {
 		/*
   	accepts a Message, Channel, Server, String ID, User