Prepare for upcoming leave/deleteServer separation (fix #198)

src/Client/Client.js

@@ -662,13 +662,13 @@ export default class Client extends EventEmitter {
 	}
 
 	/**
-	 * Leaves a Discord Server, alias to `client.leaveServer`
+	 * Deletes a Discord Server
 	 * @param {ServerResolvable} server the server to leave
 	 * @param {function(err: Error)} [callback] callback to the method
 	 * @returns {Promise<null, Error>} resolves null if successful, otherwise rejects with an error.
 	 */
 	deleteServer(server, callback = (/*err, {}*/) => { }) {
-		return this.internal.leaveServer(server)
+		return this.internal.deleteServer(server)
 			.then(dataCallback(callback), errorCallback(callback));
 	}
 

src/Client/InternalClient.js

@@ -319,6 +319,24 @@ export default class InternalClient {
 			return Promise.reject(new Error("server did not resolve"));
 		}
 
+		return this.apiRequest("del", Endpoints.ME_SERVER(server.id), true)
+		.then(() => {
+			// remove channels of server then the server
+			for (var chan of server.channels) {
+				this.channels.remove(chan);
+			}
+			// remove server
+			this.servers.remove(server);
+		});
+	}
+
+	//def deleteServer
+	deleteServer(srv) {
+		var server = this.resolver.resolveServer(srv);
+		if (!server) {
+			return Promise.reject(new Error("server did not resolve"));
+		}
+
 		return this.apiRequest("del", Endpoints.SERVER(server.id), true)
 		.then(() => {
 			// remove channels of server then the server