'render' not rendering frozen rows fix

Render() was not rendering the frozen rows when the grid had been scrolled and then the frozen options set
scrollcellintoview fix

ScrollCellIntoView was returning on occasions it shouldn't
Conflicts:
	slick.grid.js
Add pgUp pgDn functionality

Page Up and Page Down functionality were removed with the 'freeze' branch. Re-implemented
Conflicts:
	slick.grid.js
Add 'active' class to active row
Conflicts:
	slick.grid.js
Fix for paging and scrolling
Conflicts:
	slick.grid.js
Update slick.grid.js