Implement require() function

Readme.md

@@ -13,11 +13,11 @@ npm install sandboxed-module
 
 ``` javascript
 var SandboxedModule = require('sandboxed-module');
-var user = SandboxedModule.load('./user', {
+var user = SandboxedModule.require('./user', {
   requires: {'mysql': {fake: 'mysql module'}},
   globals: {myGlobal: 'variable'},
   locals: {myLocal: 'other variable'},
-}).exports;
+});
 ```
 
 ## What to do with this
@@ -43,6 +43,11 @@ following:
 * `globals:` An object of global variables to inject into the sandboxed module.
 * `locals:` An object of local variables to inject into the sandboxed module.
 
+### SandboxedModule.require(moduleId, [options])
+
+Identical to `SandboxedModule.load()`, but returns `sandboxedModule.exports`
+directly.
+
 ### sandboxedModule.filename
 
 The full path to the module.

lib/sandboxed_module.js

@@ -18,15 +18,20 @@ function SandboxedModule() {
   this._options = {};
 }
 
-SandboxedModule.load = function(moduleId, options) {
-  var trace = stackTrace.get(SandboxedModule.load);
+SandboxedModule.load = function(moduleId, options, trace) {
+  trace = trace || stackTrace.get(SandboxedModule.load);
 
   var injectableModule = new SandboxedModule();
   injectableModule._init(moduleId, trace, options);
 
   return injectableModule;
 };
 
+SandboxedModule.require = function(moduleId, options) {
+  var trace = stackTrace.get(SandboxedModule.require);
+  return this.load(moduleId, options, trace).exports;
+};
+
 SandboxedModule.prototype.getGlobalLeaks = function() {
   var self = this;
   return Object.keys(this.globals).filter(function(variable) {