Fix felixge#50: Circular requires that work with regular requires do …

…not work with sandboxed-module

lib/sandboxed_module.js

@@ -208,6 +208,11 @@ SandboxedModule.prototype._createRecursiveRequireProxy = function() {
       if (request in cache) return cache[request];
       return require(request);
     }
+
+    // Quick and dirty fix for cyclic modules
+    // Basically, put exports in cache as soon as we require something else from this module
+    cache[this.filename] = this.exports;
+
     // cached modules
     var requestedFilename = requireLike(this.filename).resolve(request);
     if (requestedFilename in cache) return cache[requestedFilename];