Adds ability to call db.load() with multiple files (closes #329)

Files can be passed one by one as a separate argument or as Array.
Mixed arguments are possible.
The callback must be the last argument and is now optional.

lib/ORM.js

@@ -5,6 +5,7 @@ var url            = require("url");
 var hat            = require("hat");
 var Query          = require("sql-query");
 var enforce        = require("enforce");
+var _              = require("lodash");
 
 var Model          = require("./Model").Model;
 var DriverAliases  = require("./Drivers/aliases");
@@ -254,12 +255,33 @@ ORM.prototype.close = function (cb) {
 
 	return this;
 };
-ORM.prototype.load = function (file, cb) {
-	try {
-		return require(Utilities.getRealPath(file))(this, cb);
-	} catch (ex) {
-		return cb(ex);
+ORM.prototype.load = function () {
+	var files = _.flatten(Array.prototype.slice.apply(arguments));
+	var cb    = function () {};
+
+	if (typeof files[files.length - 1] == "function") {
+		cb = files.pop();
 	}
+
+	var loadNext = function () {
+		if (files.length === 0) {
+			return cb();
+		}
+
+		var file = files.shift();
+
+		try {
+			return require(Utilities.getRealPath(file, 4))(this, function (err) {
+				if (err) return cb(err);
+
+				return loadNext();
+			});
+		} catch (ex) {
+			return cb(ex);
+		}
+	}.bind(this);
+
+	return loadNext();
 };
 ORM.prototype.sync = function (cb) {
 	var modelIds = Object.keys(this.models);

test/integration/db.js

@@ -129,6 +129,56 @@ describe("db.load()", function () {
 	});
 });
 
+describe("db.load()", function () {
+	var db = null;
+
+	before(function (done) {
+		helper.connect(function (connection) {
+			db = connection;
+
+			return done();
+		});
+	});
+
+	after(function () {
+		return db.close();
+	});
+
+	it("should be able to load more than one file", function (done) {
+		db.load("../support/spec_load_second", "../support/spec_load_third", function () {
+			db.models.should.have.property("person");
+			db.models.should.have.property("pet");
+
+			return done();
+		});
+	});
+});
+
+describe("db.load()", function () {
+	var db = null;
+
+	before(function (done) {
+		helper.connect(function (connection) {
+			db = connection;
+
+			return done();
+		});
+	});
+
+	after(function () {
+		return db.close();
+	});
+
+	it("should be able to load more than one file passed as Array", function (done) {
+		db.load([ "../support/spec_load_second", "../support/spec_load_third" ], function () {
+			db.models.should.have.property("person");
+			db.models.should.have.property("pet");
+
+			return done();
+		});
+	});
+});
+
 describe("db.serial()", function () {
 	var db = null;