Include README.rst in the source package
PEP8-ification.

	modified:   elasticluster/cluster.py
	modified:   elasticluster/conf.py
	modified:   elasticluster/exceptions.py
	modified:   elasticluster/main.py
	modified:   elasticluster/providers/cloud_providers.py
	modified:   elasticluster/subcommands.py