Examples improvment
Add idProperty to options object for Slick.Data.DataView
#450 create dummy columns array if empty
bugfix column can grow larger than its maxWidth

the problem was that grow passes does not take into account the width
that has been added by previous passses
Merge remote-tracking branch 'remotes/oadam/master'

Conflicts:
	slick.grid.js
Merge remote-tracking branch 'remotes/beeglebug/master'
Optimize up DataView aggregation.
Column option for 'focusable' needs a default value. Set to true, as that's the default behavior assumed by 'canCellBeActive'
No longer need to check if columns[cell].focusable is a boolean: since every column now is boolean by default, we simply return focusable at the end of the function. (The original 'return true;' is not needed because the default value here IS true.)
Merge pull request #538 from dariusk/master

Adding default focusable column option, plus minor optimization to canCellBeActive
Adding default value for selectable in column options, optimizing canCellBeSelected.
Merge pull request #540 from dariusk/master

Default selectable column option, minor optimization of canCellBeSelected
Added support for predefined group values to DataView.

New grouping info properties:
- predefinedValues - An array containing the grouping values for which
groups should be included even if they are empty.
- aggregateEmpty - Whether aggreggators should be run on empty groups.
fix editor deactivation issues

the active cell can change while the deferreds process, so ensure changes
are applied to the correct cell and the editor locks don't get crossed up
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().