validation messages in tooltips

Implementation of two kind presentation of validation messages:
- in tooltips 
- in p-tag under the input field

In both case validation message disappear on click, keydown, change and blur events of invalid input.

PS I think ParametrizedFunction is useful class and should be moved into wicket-jquery-selectors (I wrote the todo in javadoc).
Here is description of used JS:

* jquery.wb.validation.js - custom js, some kind of jQuery plugin with 2 not implemented functions: showError and hideError.
* jquery.wb.validation.message.js - custom js, extension of jquery.wb.validation.js with implementation of showError and hideError functions. First function append <p> to DOM with validation message, second - removes it.
* jquery.wb.validation.tooltip.js - custom js, extension of jquery.wb.validation.js with implementation of showError and hideError function. First function shows tooltip with validation message, second - destroys it.
* tooltip implemented with bootstrap tooltip (http://getbootstrap.com/javascript/#tooltips)

I add comments in the beginning of all js-files I use.