[#BUG 7095] Table blocking mouse wheel even if empty
Tree controller now assigns node after tree is built.

This is a great way to use the changeRoot event as a trigger for things
that need to happen when the tree is available, like opening nodes.
Adds qx.Interface.classImplements and qx.Interface.objectImplements to
detect interfaces without throwing exceptions (ie they correspond to
qx.Interface.assert/assertObject), and a mod to
qx.Class.implementsInterface to use the new methods.  This patch can
greatly reduce the number of first-chance exceptions thrown by the
framework and is especially useful when debugging code which uses the
binding mechanism.

Please see bug http://bugzilla.qooxdoo.org/show_bug.cgi?id=7330
[BUG #7273] Fixed knob positioning
[BUG #7273] remove pseudo element styles
[BUG #7273] fixed HtmlArea sizing
[BUG #7273] fixed height calculation for wrap in IE8
[BUG #7273] fixed height calculation for wrap in IE8
[BUG #7273] fixed scaled image positioning for IE8
[BUG #7447] Fixed event handling if content elements are switched
add new configuration keys to overview page

- some adaption on reference page
[BUG #6968] add general introduction to config macros
fix typo
[BUG #7441] document strage behavior and attach test case with noWin7
[BUG #7273] Removed custom theming for preview list's scrollbar.
[BUG #6866] Updated mustache.js to version 0.7.2
[BUG #6866] Removed global namespace pollution and lint warnings for new mustache.js version
[BUG #6866] Minor
fix manual warning
[BUG #6674] add 'category', 'download' and 'checksum' keys to validation and sync regexps with manual