#1041526 by katbailey - Add a link example that uses a rendered array link instead of the use-ajax class

#741694 by rfay: Add dynamic region with graceful degradation. Committing even though head seems to be broken on node_example

#741694 by rfay | tanoshimi: Create AJAX example that degrades when no JS is available. (second commit - missed added files)

#749486 by rfay: Minor tweaks to ajax dependent dropdown to make it easier to understand (hopefully)

#610440 by rfay: Advanced AJAX examples. Not complete, and dependent on 3 core patches. Committed so it can be used to look at those patches.