Fix JSCS error.
Fixed a bug where sticky group headers would not resize correctly when columns are resized
Minor clean up of the Custom Groupings example.
Add note about building project from source.
Fix an edge case bug with sticky group headers when with a top-level null group is sorted with nulls on top.
Merge branch 'master' into 68

Conflicts:
	build/0.1.0/doby-grid.js
	build/latest/doby-grid.js
	src/doby-grid.js