Ignore paddings and borders of column headers and cells when their box-sizing CSS property is set to border-box
Set a correct width for the column header placeholder
Add support for vendor prefixes
performance improvement

Conflicts:
	slick.grid.js
remove numberOfRows private member because it only used in UpdateRowCount.
remove not used variable
Fix #738 - Use an object instead of an array to hold groups by value.
Merge pull request #699 from Morhaus/box-sizing

Support the "box-sizing: border-box;" css rule for column headers
Merge pull request #725 from kzhdev/performance

Performance Improvement
Fix #744 - When multi-select is off, do not stop propagation on the shift-click event.
Add a grid initialization benchmark.
Undo an accedental edit.
Added Link to Github source

for all example pages in github pages
updated one missing source link
Merge pull request #781 from tobya/ghpages-GHLink

Link to Github Source from examples
Fix the onClick firing twice.

Temporarily comment out the code that deals with restoring focus on
clicks outside the row until I find a better solution.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	examples/example-plugin-headerbuttons.html
	slick.grid.js