fixed an issue where the dataView variable was being accessed but did not exist
Merge pull request #835 from paulsfds/master

fixed an issue where the dataView variable was being accessed but didn't exist
Fix #864 - Implement a 'destroy' method on Slick.ColumnPicker.
Update README.md
Trigger ColumnsResized event fix

Trigger ColumnsResized event in 'syncColumnCellResize' mode.
Slick.Controls.HeaderGroups added
Init of index.html
Merge branch 'gh-pages' of https://github.com/DarthVictor/SlickGrid into gh-pages