[feature] fs now throw when required

Author: AndreasMadsen

builtin/fs.js

@@ -1 +1,2 @@
-// nothing to see here... no file methods for the browser
+
+throw new Error('fs is not implemented');

test/browser/fs-simple.js

@@ -0,0 +1,12 @@
+
+var test = require('tape');
+
+test('require fs should throw', function (t) {
+  try {
+    require('fs');
+    t.ok(false, 'fs did not throw');
+  } catch (e) {
+    t.ok(true, 'fs did throw');
+  }
+  t.end();
+});