stop, listclusters, listnodes, documentation
Merge branch 'master' of https://github.com/gc3-uzh-ch/elasticluster

Conflicts:
	docs/config.template.ini
	elasticluster/cluster.py
	elasticluster/conf.py
	elasticluster/main.py
	elasticluster/providers/cloud_providers.py
	elasticluster/subcommands.py