The change from class 'container' to id 'card-panel' screwed up
something with CSS selectors specificity, so making the ID into
a class and moving h3 styles back below .card-panel.

This was a bogus/hacky implementation.  Not all classes in the world
will start with "Ext." - for example when we generate docs for this
very docs app itself.  Or deciding that class names can't be
all-lowercase.

Needs to be implemented properly.

Looking up guides from the main page is much more useful, there
aren't that many of them.

Besides the top100 list contained only 99 items anyway, now even less.

"container" is too ambiguous - everything is a container.
Not good to have one specific container named "container".

- Renamed some classes with more sensible names.
  Instead of two two divs having .legend class, we now have
  .section class that's applied to all main divs on index page.

- Removed extra </div>

- Moved all index-page styles to one place.

- Reduced some of the duplication.

- There's no tables.
- There's no h2.
- There's no .piechartlinks div.
- There's no .group div.

Instead of using plain:true on tab-panel, setting some custom styles
to render it almost like plain:true would.  For some reason the
plain:true just produced something ugly - now looks much better.

Also renamed the ID of tab-panel and reformatted the styles a bit.

We aren't really sorting it.

Also fixed comment for Top100 model.

Cherry-picked from nick/alt-tabs branch.

For example with code like this:

    /**
     * My Function
     * @param {Number} foo
     */
    function blah(foo, bar) {
    }

The previous behaviour of JSDuck was to include both parameters
to documentation.  After this change only the first parameter
will be documented, allowing us to easily have hidden parameters
for internal use, which is quite common in ExtJS.

Separated aliases resolving to a separate class.  More convenient
to do it after all classes have been converted into Class instances.

Links to members can now optionally also specify member type.

Previously @alias could only be used for instance methods.

Initialize :members and :statics arrays automatically when instanciating
JsDuck::Class.

Show class name if class selected.
Show guide name if guide.
Otherwise show the normal title, like it used to be.

This way the text of the message can be configured from Rakefile.
Also, the default is now not to show the message - the message is
only added to page in "export" task.

Also added some more descriptive comments for tasks.

Useful for showing some about-information for the docs.

Added code to Rakefile to display the current JSDuck revision there.

Added extra div surrounding each subsection.
Subsections now also get correctly shown/hidden.