Merge pull request #155 from catodique/master

Here is my pull request after you replied to my mail
Added .w2ui-spinner class for the spinner
Move some properties back to the object from prototyp

Inheritance was not working properly
Implemented easy way to do subgrid in a grid.
Laid foundation for w2utils.keyboard object
Small fixes for subgrid, other CSS
Recompiled JS and CSS
Fixed issue #158
Various bugs
Added grid.autoLoad for infinite scroll
Recompiled JS and CSS
Fixed offset value for grid
Recompiled JS
Infinite scroll bug fixes
Recompiled JS
Added form.onValidate event (issue #162)
Fixed grid.scrollIntoView()
Fixed small popup issue
Fixed issue #161
Fixed issue #156