Added leave server and other stuff

lib/Client/Client.js

@@ -251,6 +251,20 @@ var Client = (function (_EventEmitter) {
 		});
 	};
 
+	Client.prototype.leaveServer = function leaveServer(server) {
+		var callback = arguments.length <= 1 || arguments[1] === undefined ? function (err) {} : arguments[1];
+
+		var self = this;
+		return new Promise(function (resolve, reject) {
+
+			self.internal.leaveServer(server).then(function () {
+				callback();resolve();
+			})["catch"](function (e) {
+				callback(e);reject(e);
+			});
+		});
+	};
+
 	return Client;
 })(EventEmitter);
 

lib/Client/InternalClient.js

@@ -69,6 +69,46 @@ var InternalClient = (function () {
 		});
 	};
 
+	//def leaveServer
+
+	InternalClient.prototype.leaveServer = function leaveServer(srv) {
+		var self = this;
+		return new Promise(function (resolve, reject) {
+			var server = self.resolver.resolveServer(srv);
+			if (server) {
+
+				request.del(Endpoints.SERVER(server.id)).set("authorization", self.token).end(function (err, res) {
+					if (err) {
+						reject(new Error(err.response.text));
+					} else {
+						// remove channels of server then the server
+						for (var _iterator = server.channels, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+							var _ref;
+
+							if (_isArray) {
+								if (_i >= _iterator.length) break;
+								_ref = _iterator[_i++];
+							} else {
+								_i = _iterator.next();
+								if (_i.done) break;
+								_ref = _i.value;
+							}
+
+							var chan = _ref;
+
+							server.channels.remove(chan);
+						}
+						// remove server
+						self.servers.remove(server);
+						resolve();
+					}
+				});
+			} else {
+				reject(new Error("server did not resolve"));
+			}
+		});
+	};
+
 	// def login
 
 	InternalClient.prototype.login = function login(email, password) {

lib/Client/Resolver/Resolver.js

@@ -20,6 +20,21 @@ var Resolver = (function () {
 		this.internal = internal;
 	}
 
+	Resolver.prototype.resolveServer = function resolveServer(resource) {
+		if (resource instanceof Server) {
+			return resource;
+		} else if (resource instanceof ServerChannel) {
+			return resource.server;
+		} else if (resource instanceof String || typeof resource === "string") {
+			return this.internal.servers.get("id", resource);
+		} else if (resource instanceof Message) {
+			if (resource.channel instanceof TextChannel) {
+				return resource.server;
+			}
+		}
+		return null;
+	};
+
 	Resolver.prototype.resolveFile = function resolveFile(resource) {
 		if (typeof resource === "string" || resource instanceof String) {
 			return fs.createReadStream(resource);