The template/ dir is expected to contain extjs/ dir where the
whole ExtJS resides.

The main docContent div now contains three divs:

- api-overview : the content on front page
- api-guide : the content of guide
- api-class : the docs of some class

These divs are shown and hidden as needed.

sdk.sh script now also copies over the guides and converts them to HTML
using rdiscount (which should be installed as a dependency for JSDuck).

On front page we add click listeners to all the guide links and load the
guide HTML over Ajax.

That's the script I'm currently using for development.

Added bunch of comments of why certain command line options are passed.

Clicking on member in toolbar menu now correctly scrolls to that member.

Clicking on the Configs/Properties/Methods/Events buttons now
scrolls to appropriate section.

Updated the existing hiding code to be in sync with changed class names.
Also added comments and simplified it quite a bit.

We don't really need it at initialization time in ClassPanel and
OverviewPanel - it's only needed in load() method to which it's
already supplied.

In addition to expandable class, added not-expandable class for
links that should do nothing when clicked.

Instead of few complex templates, using more simpler templates
in combination with bunch of methods.

Allows to avoid warnings when extending classes for which we don't
have source code.  For example in ExtJS it's useful to specify
--external=Error, because Ext.Error extends the built-in Error
object.

With expandable class either set or not, as needed.

The calculation of first-child seems way too complex, but at least
it works.  Should be encapsulated somewhere.

- Removed empty anchor tag - using id attribute on h3 instead.
- Replaced cryptic classname "p" with "members-title".
- Adding a differenciating ID to the parent div and using
  descendants selector to set icon for the contained h3.

This way all styles are in the same format - like in ExtJS.
Additionally my editor has support for scss syntax, but not for sass.