fixes issue but may introduce side effects
actually fix problem

added a click handler to the backdrop of the first modal.  we have it set so
that this is the only backdrop.  when you click the backdrop, all modals are
closed, not just the one owning the backdrop.  the click handler is only
registered once.
Merge branch 'master' into 31-multiple-modals
only close open modals.  good point john
use the existing modal manager close method
Merge pull request #31 from goodybag/31-multiple-modals

When multiple modals are open, clicking outside only closes 1