flatten dom folder.
move dom/reactive support modules to wire/lib/dom/
new listenForChanges module
rename stringifyJsonPath --> jsonPath and add getter/setter functionality
use new jsonPath and listenForChange modules
cleanup
better way to find a form element
Merge branch 'render-plus' of github.com:cujojs/wire into render-plus
change some names and collapse/merge stringify() and transform() into a single operation