Support for Column picker check/uncheck all
Changed demo for Board widget to bind on to new event
New Features and Bug fixes

- Fix to display of messages - now in a place that is always visible
- Fix to board headers so that their height is normalized and resized along with board data columns
- Column picker now display number of columns selected
- Support for specifing which board columns should be visible
- New Method: setVisible - sets visible columns on board
- Tiggering of event when columns are changed.
Board documentation updates in support of new functionality
Update to latest built plugin files.