Improved Checkbox editor ValueChanged behavior.

Checkbox editor was firing onCellChange event even when there was no change. This fixes that behavior and also returns a boolean on serialzeValue instead of the previous "checked" or undefined.
Remove usage on $.browser for jquery 1.9.0

jquery 1.9 has removed support for $.browser, use navigator.userAgent
instead
Merge pull request #543 from pzgz/jquery.1.9.0.fix

Remove usage on $.browser for jquery 1.9.0
incorporated suggestions by mleibman
Merge pull request #542 from wilcley/master

Checkbox editor ValueChanged event behavior fix
Optimize DataView flattenGroupedRows().
Add option to hide totals row.

Allow groups to exclude the subtotals from the rendered grid.

This is to allow using group formatters to display aggregate information in the group header rather than in a footer section (if desired).
I'm sure there are other uses as well, I just haven't been able to think of any.

Also added a new groupingInfoOption:
* displayTotalsRow (defaults to true).

We'll see if Github is smart enough to update the existing pull request.
Merge pull request #550 from svieira/patch-2

Add option to hide totals row.
Merge remote-tracking branch 'mleibman/master'
Ignore IDE files