Adding composer.json
Removing app code since it's been extracted to croogo/croogo-app
Remove submodules since they now belong in APP dir
Move core plugins to toplevel
Move app's Schema directory to Croogo plugin
Path adjustments
README: Document new directory structure and composer notes
Croogo: Path fallback for inherited controllers

When an app level controller extends a core Croogo controllers, eg:

	class MyNodes extends NodesController {
	}

Cake will only try to find view files in App/View/Nodes.

This allows fallback to views defined in the parent plugin.
Renaming test class and file names

Rename our test classes and files to prevent conflicts since
AllTest and friends are typically used by APP level tests.
Adjust travis.yml for new directory layout
composer.json: Add vendor-dir clause
Extensions: do not assume plugins are under APP
Update travis.yml for 5.2 just to make fahad19 happy
Merge branch '1.6-vendorization' into 1.6