Revert "realpath files during module load"

This reverts commit 131546e733.

Doesn't work on windows, coming back soon.

src/node.js

@@ -169,7 +169,7 @@
         try {
           var stats = fs.statSync(requestPath);
           if (stats && !stats.isDirectory()) {
-            return fs.realpathSync(requestPath);
+            return requestPath;
           }
         } catch (e) {}
         return false;
@@ -277,7 +277,6 @@
       if (!filename) {
         throw new Error("Cannot find module '" + request + "'");
       }
-      id = filename;
       return [id, filename];
     }