Fix queuing of multiple items for one project

Signed-off-by: Aki Asikainen <aki.asikainen@kone.com>
allow admins to unreserve resources reserved by other users

Signed-off-by: Robin Jarry <robin.jarry@6wind.com>
[maven-release-plugin] prepare release lockable-resources-1.3
[maven-release-plugin] prepare for next development iteration
Merge remote-tracking branch 'upstream/master' into bugfix

Conflicts:
	src/main/java/org/jenkins/plugins/lockableresources/LockableResource.java
	src/main/java/org/jenkins/plugins/lockableresources/LockableResourcesManager.java