fix #355 button widget not focusable

In IE8+ the Button widget is not focusable because of the onfocusin method
used as an hack in <IE8
Closes #357
fix #365 skin inherited by the Bridge

closes #368
fix #273 additional whitelisted attributes

autofocus, autocomplete, autocapitalize, autocorrect and spellcheck attributes are now in the whitelist.
closes #372
fix #369 - AT Debug Tools not working on IE7/8 after AT v1.2-4
pull request #370
doc Getting started with AT

closes #375
fix #373 setJsonPostData uses deprecated properties

Instead of using the deprecated `jsonData` now use the standard `data` property to encode data information from a request filter
Closes #374
fix #376 Issues in html TextInput widget

- Autoselection occurring even when the field already had focus
- Placeholder text in browsers that do not support the native implementation was selectable
fix #377 Preload images not working for IE10.

Closes #378.
fix #379 TemplateCtxt.getDomId does not support integers.

Closes #380.
fix #361 for autocomplete freetext

Closes #362.