Always show only the first sentence, no matter how short it is.

Now the index page component is separate from components dealing with
rendering parts of docs for particular class.

No more passing the docClass config option to TabPanel and Overview -
it's not used anyway.

So we can call it similarly to cls.Overview.

Also no more pass initial class config to the header component.

A verb is not really a good name for class.

More descriptive.

Instead of putting them directly to class hash, we create a sub-hash
for members.  This way we don't have to list all the member types
in every place where we want to loop over all the types - we just
loop over the :members hash.

Additionally it will make easier in the future to add a separate
group of static members.

This was too confusing.  We still have @member in doc-comments,
but it's translated to owner internally.

Currently not used, so throwing out for now.

Currently I implemented it with opacity, but I'm sure a designer
could do a better job.

In Ext4 each event handler will receive an additional options argument
that was given in the addListener method.  To make this clear, we
automatically append this extra parameter to each event.

- Separated out two events: showClass and showMember.
- The showMember now also gets fired when navigating to a member
  within one class.
- All the tracking events are now fired *after* the thing has happened.
  That's the common practice in ExtJS and also useful when something
  goes wrong in the event handler.
- Added documentation.
- Cleaned up trailing whitespace.

Again, use classname instead of ID for styling.

Also Docs.Favorites no more calls for some global treePanel component,
but is instead given the TreePanel it should use.

No more access ClassOverview by ID. Instead it just has a classname
which is also used for styling in CSS.

The tab panel no more uses an ID.