Simplify and correct test.

Fix by Fedor Indutny.

The REPL needs the full require(); add test for that behavior.

to enable KQueue, rather than deciding based on the compiler version.

Add tests and docs.

(this also splits the file into upper "setup" and lower "startup" sections)

The main system is built upon this, and is optional, if only natives
are used in application (eg. node-core).

Natives not loaded into own context if NODE_MODULE_CONTEXTS=1.
This have its inner logic, if natives are seen just as lazy-loaded
parts of the core.

And fix missing var!

It would be good to get this script running at the end of every test, so we
know that modules aren't leaking either - but it will require a lot
modification of the tests so that they themselves aren't leaking globals.

Found by Cliffano Subagio
http://groups.google.com/group/nodejs/browse_thread/thread/f46f093938265ac0/387e14da08c7dd7b?

- Handle only the most basic of query string parsing and construction.
  Leave the rest (e.g. Rails/PHP behaviors) to modules higher up the
  stack, like Express.

- fix AttributeError on "use_openssl" when doing ./configure --without-ssl - error was: AttributeError: Values instance has no attribute 'use_openssl'