Update Panels and Panelizer for SA-CONTRIB-2016-047 and SA-CONTRIB-2016-048

Patch is attached! I'll start a build on Travis in a moment.

EDIT: Here's the Travis build: https://travis-ci.org/panopoly/panopoly/builds/153087240

Blergh. Unfortunately, all the tests are failing now. It could be a gremlin but I haven't had a chance to look into it yet.

Ok, I figured out what is going wrong. All the Panels displays that we exported to code don't have the storage_type and storage_id set on them. Here's a patch to panopoly_test just to demonstrate what's going on - got the storage type/id set in the database and then reexported to the Feature. I'll even try with the tests to double check that this is the issue.

Here's a snippet to show:

+  $display->storage_type = 'panelizer_default';
+  $display->storage_id = 'node:panopoly_test_page:default';

EDIT: Here's the test build: https://travis-ci.org/panopoly/panopoly/builds/153104500

Here's a 2nd attempt at just the panopoly_test changes. This should get more of the tests passing on Travis.

Here's a new panopoly_core patch that also fixes the storage type/id on the panels in that Feature, and includes a Panelizer patch that improves the update hook: #2785883: Infinite loop in panelizer_update_7303

EDIT: Here's a new Travis build: https://travis-ci.org/panopoly/panopoly/builds/153151355

Here's patches for panopoly_users and panopoly_pages. There's more to come for the modules that only do Page Manager, and not Panelizer!

And here's the last round of patches.

EDIT: Here's a test build with all the patches: https://travis-ci.org/panopoly/panopoly/builds/153155022

Here's a new panopoly_core patch that integrates the backcompat changes from these Panels and Panelizer patches:

#2785915: Panels permissions update causes access denied on page manager pages defined in code

#2785945: Access denied when editing a Panelizer default that comes from code

EDIT: Here's the test build on Travis: https://travis-ci.org/panopoly/panopoly/builds/153163287

Update to the latest version of the Panels patch in #2785915: Panels permissions update causes access denied on page manager pages defined in code

EDIT: Here's the test build on Travis: https://travis-ci.org/panopoly/panopoly/builds/153245452

Tests are passing on the patches, so I committed! I may still need to update again depending on what happens on the Panels and Panelizer issues, but this definitely appears to work for us, so I'd like to move closer to an actual release

EDIT: Here's the Travis build for the committed changes https://travis-ci.org/panopoly/panopoly/builds/153267069