Added "onHeaderMouseEnter" and "onHeaderMouseLeave" events for column headers. (cherry picked from commit a648d5a)
Revert "Added "onHeaderMouseEnter" and "onHeaderMouseLeave" events for column headers. (cherry picked from commit a648d5a)"

This reverts commit 193c4d18b522851d1436855614c1d796ece957eb.
Merge branch 'v2.0' of https://github.com/dipple/SlickGrid.git