Disabled c3p0 because it makes the SlipStream server unreachable after some minutes.
Updated the OpenStack connector to use the new OpenStack CLI (https://github.com/slipstream/SlipStreamClient/commit/f74e0bfd25ba4b0a18a682ed33128fd707544d4c)
Removed jClouds dependency.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into okeanos_connector