use native Array.isArray instead of is_js

lib/mongorito.js

@@ -349,7 +349,7 @@ Model.prototype.hook = function (when, action, method) {
 	// if array is given
 	// iterate and call .hook()
 	// for each item
-	if (is.array(method)) {
+	if (Array.isArray(method)) {
 		let methods = method;
 
 		methods.forEach(function (method) {
@@ -524,7 +524,7 @@ Model.prototype.save = function (options) {
 	keys.forEach(function (key) {
 		let value = self.get(key);
 
-		if (is.array(value)) {
+		if (Array.isArray(value)) {
 			value = value.map(function (doc) {
 				return doc.get('_id');
 			});

lib/query.js

@@ -106,7 +106,7 @@ Query.prototype.match = function () {
 Query.prototype.include = function (key, value) {
 	let self = this;
 
-	if (is.array(key)) {
+	if (Array.isArray(key)) {
 		let fields = key;
 
 		fields.forEach(function (key) {
@@ -142,7 +142,7 @@ Query.prototype.include = function (key, value) {
 Query.prototype.exclude = function (key, value) {
 	let self = this;
 
-	if (is.array(key)) {
+	if (Array.isArray(key)) {
 		let fields = key;
 
 		fields.forEach(function (key) {
@@ -339,7 +339,7 @@ Query.prototype.find = function (query, options) {
 				let childModel = options.populate[key];
 				let value = doc[key];
 
-				if (is.array(value)) {
+				if (Array.isArray(value)) {
 					value = Promise.map(value, function (id) {
 						return childModel.findById(id);
 					});
@@ -438,7 +438,7 @@ methods.forEach(function (method) {
 // or, nor and and share the same imlpementation
 ['or', 'nor', 'and'].forEach(function (method) {
 	Query.prototype[method] = function () {
-		let args = is.array(arguments[0]) ? arguments[0] : Array.prototype.slice.call(arguments);
+		let args = Array.isArray(arguments[0]) ? arguments[0] : Array.prototype.slice.call(arguments);
 		let operator = '$' + method;
 
 		this.query[operator] = args;