- eslint issues
- hidden checkboxes were not toggling correctly, so functionality was broken

- Load Google library once per page, instead of once per Captcha
- Allows proper functioning of multiple embedded ReCaptchas in a single set of search results

- Resolves VUFIND-1197

After exploring new options to make login detection more robust, this is still the best system. Will continue to investigate.

Conflicts:
	themes/bootstrap3/js/cart.js
	themes/bootstrap3/js/lightbox.js

Conflicts:
	themes/bootstrap3/js/cart.js
	themes/bootstrap3/js/lightbox.js
	themes/bootstrap3/js/openurl.js

Conflicts:
	themes/bootstrap3/js/lightbox.js

- Do not register the same object multiple times, or create duplicate objects.
- Make sure objects are initialized even if register() is called after init().

Tried git merge --squash

Squashed commit of the following:

commit 3945fdb723deacf5050f1b5e33e224c9bb452815
Merge: 63ffa60 9f3fb74a
Author: Chris Hallberg <crhallberg@gmail.com>
Date:   Wed Mar 30 16:56:03 2016 -0400

    Merge remote-tracking branch 'origin/master' into vufind-register

commit 63ffa6043ef91e22a2657f91d8c6a7b68667a380
Author: Chris Hallberg <crhallberg@gmail.com>
Date:   Wed Mar 30 09:42:11 2016 -0400

    Closer adherence to the reveal module model.

commit 0ebb57e9e6a4d1909570ead6e4636a59f7a80e80
Author: Chris Hallberg <crhallberg@gmail.com>
Date:   Tue Mar 29 12:32:37 2016 -0400

    Register and init in VuFind.

* closing </div> missing

- Rewrote Javascript to make better use of server-side logic
- Eliminated many server-side special cases specific to lightbox handling
- Adjusted test suite to accommodate improvements