Update to use current ansible version (1.7.2)
Merge pull request from John Morrissey (https://github.com/jwm)
Remove dependency from ansible 1.3.3
Partially implement pull request   https://github.com/gc3-uzh-ch/elasticluster/pull/114 from John Morrissey.
Add tag `Name` to EC2 instances, and use `<cluster.name>-<node.name>` as name for the instance.
Update playbooks to work with Ansible 1.7.2
Fix playbooks for slurm/precise
More bugfix
Fix gluster playbooks
Fix core-site.xml file not correctly parsed by hadoop
Fix more playbooks