Formerly meta-tags only worked inside class comment.

Each warning is now signed a type, and using the new --warnings
option one can turn specific warnings on or off.  For example to
show only warnings about global members:

    --warnings=-all,+global

Increase editorHeight by toolbar height after checking if editor gave us
height - otherwise the check will always succeed.  Fixes inline examples
height in ExtJS examples.

Most importantly this fixes the current white background of header
in Opera and IE.

The footer styles had been nested under #treecontainer, but the #footer
div was not actually there.

Now the expansion happens only when there's just one expandable
item at root level.  Basically this means that when we have two
namespaces like Ext and Blah, then neither gets expanded by default,
but if there's just Blah, it will be expanded.

When we see @class Foo, but Foo is also defined as alternateClassName,
then merge Foo into the class that defined Foo as its alternate name.

Use signature class for base styles and combine other classes
with it for additional styles.

Move the colors definition to mixin so it can be shared between
toolbar and class overview page.

Remove all the unused sprites.
Reorder others so that each one is 40px from previous.
Remove unused 3px from one side.

They really don't fit there well. And by removing them, the comments
system stays a bit more separate from the rest.

Combine configs icon with sprite inside icons.png.  Throw others
just away as they already exist inside icons.png.

All sections now have class members-section instead of type-specific
id-s.  This also simplifies the code to loop over all sections.

Comments are now in separate comments-section.

Instead of using separate image files for each of the icons there.

This allows us to get rid of class-sm.png file.

Also adjust the config icon offset by a pixel so it's not clipped.

Include icons to tree, toolbar, tabs.  But not at root level.
Also remove !important.

Remove old style rules for guides and legend sections on categories
page which are there no more.

Rename the main class into class-categories.

Remove extra 'classes' class from sections - there's now only
one type of sections.

Rename column classes with better names.

Merge together several style rules scattered around in viewport.scss.

Referring a component by auto-generated ID?

Besides, this rule seemed to have no visible effect at all.

Rename two CSS classes to-use-dashes instead of camelCase -
more CSS-ish.

Remove !important from style rules not needing it.

Add image to local images/ dir.

Instead of .all-demos class, we now have a .thumb-list class which
makes much more sense.  Also the #sample-ct ID has been removed,
as it doesn't make sense to use an ID inside a component that's
used in multiple places.

Finally, don't link the two image files from extjs dir but instead
copy them over to local images/ dir.

It's more of an ExtJS convention that mandatory parameters won't come
after optional ones.  jQuery for example has many methods that make
use of optional parameters before mandatory ones.