First commit. Updating database +tests.
Updating composer.lock + removing fetch eager from parent in ResourceNode + fixing most controllers.
Fixing resource reordering + logs.
Various bug fixes.
Updating submodules + migrations.
Cleaning migrations.
Fixing resource log creation.
Update doc.
Fixing resource creation test.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	composer.lock
	src/core/Claroline/CoreBundle/Resources/public/js/resource/manager.js
	src/core/Claroline/CoreBundle/Resources/views/Resource/breadcrumbs.html.twigjs
	src/core/Claroline/CoreBundle/Tests/Manager/ResourceManagerTest.php
Fixing tinymce resource picker.
Fixing manager.js merge.
Fixing pull request.
Merge pull request #180 from ngodfraind/master

Removing the resource hierarchy.