Upload file with drag n drop
Merge remote-tracking branch 'origin/master' into HEAD

Conflicts:
	src/core/Claroline/CoreBundle/Resources/translations/platform.en.yml
	src/core/Claroline/CoreBundle/Resources/translations/platform.fr.yml
	src/core/Claroline/CoreBundle/Resources/views/Tool/workspace/resource_manager/resources.html.twig
Updating and fixing drag & drop upload.
Merge pull request #182 from ngodfraind/dragndrop

Dragndrop
Merge pull request #80 from claroline/uploadFileDnD

Upload file with drag n drop