simplify AMD definition
Merge pull request #2962 from sheppard/patch-1

update AMD recommendation in plugin guide
Minor change in comments for better consistency
Merge pull request #2963 from ogwiz2/patch-1

Minor change in comments for better consistency
update deps
move some GridLayer tests, add createTile stub
fix GridLayer tile loading edge case
fix 404 warnings in tests
fix GridLayer.redraw regression, close #2966