loader: Fix GH607 by adding proper array support

JSON spec does not allow objects of the same name at the same
level.  But, that's what we used to allow with "layer" definitions.
Update new file version to 1.0.1, add "layers" array object, and
add multiple "layer" definition warning.

Change-Id: I040f07897c689800364d243daf3c247f1b3cace7
2 files changed