Update ZeLib.js 1.0-b.4

- [Add] function for filtering a JS Array
- [Add] JS Date test
- [Add] clone_object function
- [Add] vb function call by ajax
- [Add] add parameters to url
- [Add] string prototype capitalize
- [Add] warning function
- [Update] Error throw function
- [Update] Get week number function -> Accept a JS date in input
- [FIX] bad reference to function in repartion graph drawing
- [FIX] bug with negative value in time repartion graph drawing