Fixed printing of tutorial URLs.
Changed lib.
Added library updates checker.

Conflicts:
	admin/class-h5p-plugin-admin.php
Library managers can now restrict access to selected libraries.

Conflicts:
	admin/class-h5p-editor-wordpress-storage.php
Fixed printing of tutorial URLs.

Conflicts:
	admin/class-h5p-editor-wordpress-storage.php
Remove setting on uninstall.
Use the latest core.
Fixed get library upgrades and optionSet impl.
Merge branch 'restricted-libraries-usage'