Fill in some missing sections in the Sky README.md

sky/HACKING.md

 Hacking on Sky
 ==============
 
 Building
 --------
 
-* Follow the setup & build instructions for [mojo](https://github.com/domokit/mojo)
+* Follow the setup & build instructions for [Mojo](https://github.com/domokit/mojo)
 * Build ``sky`` with ``ninja``, e.g. ``ninja -C out/Debug sky``
 
 Running applications
 --------------------
 
-* ``./sky/tools/skydb --debug``
+* ``./sky/tools/skydb [url]``
   * You should see a ``(skydb)`` prompt
   * Type ``help`` to see the list of available commands
-  * The most common command is to load a URL, which youc an do simply by typing
-    the URL.  To reload the current page, type enter.
 
 * ``./sky/tools/test_sky --debug``
   * This should run the tests
 
 Running tests manually
-----------------------------
+----------------------
 
- * ``sky/tools/run_sky_httpd``
- * ``out/Debug/mojo_shell --args-for="mojo://native_viewport_service/ --use-headless-config" --content-handlers=text/html,mojo://sky_viewer/ --url-mappings=mojo:window_manager=mojo:sky_tester mojo:window_manager``
- * The ``sky_tester`` should print ``#READY`` when ready
- * Type the URL you wish to run, for example ``http://127.0.0.1:8000/lowlevel/text.html``, and press the enter key
- * The harness should print the results of the test.  You can then type another URL.
+* ``sky/tools/run_sky_httpd``
+* ``out/Debug/mojo_shell --args-for="mojo://native_viewport_service/ --use-headless-config" --content-handlers=text/html,mojo://sky_viewer/ --url-mappings=mojo:window_manager=mojo:sky_tester mojo:window_manager``
+* The ``sky_tester`` should print ``#READY`` when ready
+* Type the URL you wish to run, for example ``http://127.0.0.1:8000/lowlevel/text.html``, and press the enter key
+* The harness should print the results of the test.  You can then type another URL.
 
 Writing tests
 -------------
 
-* Import ``tests/http/tests/resources/mocha.html``
+* Import ``resources/mocha.html`` and ``resources/chai.html``
 * Write tests in [mocha format](http://visionmedia.github.io/mocha/#getting-started) and use [chai asserts](http://chaijs.com/api/assert/):
-```
+```html
 describe('My pretty test of my subject', function() {
   var subject = new MySubject();
 
   it('should be pretty', function() {
     assert.ok(subject.isPretty);
   });
-
 });
 ```