respect NODE_PATH env variable while resolving modules

Author: anru

Diff for: file-system-loader.js

@@ -70,7 +70,10 @@ var FileSystemLoader = (function () {
         // if the path is not relative or absolute, try to resolve it in node_modules
         if (newPath[0] !== '.' && newPath[0] !== '/') {
           try {
-            fileRelativePath = nodeResolve.sync(newPath, { basedir: rootRelativeDir });
+            fileRelativePath = nodeResolve.sync(newPath, {
+              basedir: rootRelativeDir,
+              paths: process.env.NODE_PATH.split(_path2['default'].delimiter)
+            });
             // in this case we need to actualize rootRelativePath too
             rootRelativePath = _path2['default'].relative(_this.root, fileRelativePath);
           } catch (e) {}