Added possibility to set autosearchDelay in filter toolbar
improve code of columnChooser

Add `dialogClass: "ui-jqdialog"` option to the dialog to have correct size of font independent on the current `em` size.
Use internal `data` of the multiselect widget to access all internal elements.
Prefer to use `$.ui.multiselect.prototype.widgetFullName || $.ui.multiselect.prototype.widgetName` instead of `"ui-multiselect"` or `"multiselect"`.
Fix cut&pased error
Add .ui-jqgrid-hdiv { overflow-y: hidden; }
Fix spelling mistake in Dutch translations.
A classic DT spelling error...
Update grid.locale-nl.js
Fixed own typo
Merge pull request #645 from jdetaeye/master

Fix spelling mistake in Dutch translations.
Merge pull request #648 from EricSmekens/patch-1

Update grid.locale-nl.js
Merge pull request #639 from kirilvit/master

Added possibility to set autosearchDelay in filter toolbar
Merge pull request #644 from OlegKi/master

Improving columnChooser, fixing overflow-y of hdiv
Fixes in editRow in case url is set to be a local data array.