Sortable Tests: Add tests for axis option and recent axis option bugs.(cherry picked from commit 4484c52a4d29ea4da53446ddea9f85b3f1231b06)
Grunt: Add lint and test aliases.
(cherry picked from commit d8468a33790da8e7be46552325e932162b1942af)
Grunt: Run all CSS files through csslint.
(cherry picked from commit 5fb68636d19a40451d1190b9a5255d86616d54f5)