update cross() to use webkit feature detection

jQuery no longer supports $.browser
Merge pull request #148 from raisch/master

refactored cross() to use feature detection rather than $.browser.webkit
Small CSS changes
Added w2form.submit as alias for w2form.save
Infinite Scroll - first cut
Recompiled JS and CSS
Fixed issue #149
Changed w2laout resizer to be part of the panel
Updated w2grid.request docs
Fixed multiple bugs related to grids infinite scroll
Recompiled JS and CSS
Added w2popup.keyboard - close on esc
Optimized w2layout resize
Fixed issue #135
Move some object properties to prototype.
Small CSS clean-up changes
Small w2popup kyeboard fixes
Added $().w2marker(str) to highlight text on screen.
Small grid fixes
added url feature to list