Update jQuery bower dependency to 2.1.x
return region instance on region.show

thus allowing simple enable chaining of
region operations.
add a test to throw an error if bower components not installed

For now `npm test` fails silently if `bower install` command have not
been run before
Typo fixes, simplified a few complicated phrases.
Re-indent behaviors test
Fix Behavior onShow and onClose proxying
Bump and build v1.8.6