Merge pull request #8 from crowbar/release/pebbles/master

pull last changes
Stop installing python-keystone package

This is not needed since commit 930f273, when we moved to using
keystoneclient.middleware.auth_token.
Merge pull request #111 from vuntz/no-python-keystone

Stop installing python-keystone package
Merge pull request #9 from crowbar/release/pebbles/master

pull changes from dell
backing_type was changed into default_store for some reasons, obviously not working after that
Merge pull request #115 from MirantisDellCrowbar/bug/js/pebbles/master

backing_type was changed into default_store for some reasons