Numberfilter

Hi esvit,

Please can you take a look a my branch. I hope you find it to your satisfaction.
1 - Added a numeric text filter - which gives some validation of inputs
2 - Extended the default getData() to have basic filtering and ordering by default.
3 - Modified the demo4 to show its usage.

I would like have developed advanced filtering change which allows || && and also operators <>!= : It would be good to chat about if it is something that you consider merging.

Kind regards,
James