Add missing JASidePanels submodule definition.
Update libSub to pull in new EX2Kit changes to fix crash on iOS 8.

New EX2Kit renames some functions:
  runInMainThread -> runInMainThreadAsync
  runInBackground -> runInBackgroundAsync
Use my libSub so the repo is self consistent.
Merge branch 'fix-missing-jasidepanels' into david

* fix-missing-jasidepanels:
  Add missing JASidePanels submodule definition.
Merge branch 'fix-ios8' into david

* fix-ios8:
  Update libSub to pull in new EX2Kit changes to fix crash on iOS 8.