Replace all references to cell.cellIndex by $(cell).index() to prevent error.
"Unexpected call to method or property access."
see: http://stackoverflow.com/questions/14201168/table-cell-index-problems-in-ie8
closes #551
Merge pull request #554 from sylvain-hamel/fix-553

Replace all references to cell.cellIndex by $(cell).index() to prevent error
fix docs so nested accordions open with hash
Cell column property has correct value again. Fixes #551
fix columnSelector widget removal function
Child row updates. Fixes #556 & part of #396

Add tablesorter-hasChildRow
If the last pager row has any child rows, they are now included
Add "filtered" css definition to every theme to hide content
Add resizable_widths option. Fixes #555
version bump