Added data formatting middleware + A few bugfixes.

This is a merge and clean up of #55 into the current master.

Features
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* Added extendable middleware and datacol middleware object.
* Fixed missing parseInt radix (base 10). 
* Updated to latest jQuery for example pages.
* Fix for #9 from http://stackoverflow.com/a/10615589
* added getGridClass function for doing hacks on the grid class
* Fixed a few mixed tabs and spaces.
* Added feature to disable colMove and disabled selecting the column header.