AjaxHoverable extra CSS hook

Added another hook for writing CSS rules. The outermost div gets another class "showHoverable" when the hoverable is active.

Signed-off-by: Aaron Rosenzweig <aaron@chatnbike.com>
Merge pull request #468 from recurve/AjaxHoverable_CSS_Hook

Ajax hoverable css hook. With examples even!
javadoc fix.
Add a matchingValues() method to ERXQ that takes a variable-length list of things to use for qualifiers, and tests thereof.
Some other testy goodness.
method name spelling fix