- do not use the minified files in the demos & tests: we want maximum debugability there!

- Also remove the old version test files

- updated qunit + jquery.
modern jQuery does not support $.browser anymore: it long been obsoleted; we provide an alternative solution for the one place where this feature is used by w2ui: cross(), when generating translate3d/translate-based CSS animations.

Note: we might want to leave stuff like this to a dedicated library like Modernizr...