fileUploader.js ported to jquery and others

sebrojas14 (30/10/2013): 
   - ported from prototype to jquery
   - added nice units to large files error message (KB and MB)
FileUploadField.ascx ported to jquery
Correction of texts and some comments
Prevents text "0%" appears over loading image in IE7-
Merge pull request #1 from sebrojas14/master

Ported to jQuery and some improvements