Wrapping parameters of Parameterized into ConcurrentHashMap
Merge branch 'master' of github.com:slipstream/SlipStreamServer

Conflicts:
	jar-connector/src/main/java/com/sixsq/slipstream/factory/ParametersFactory.java
	jar-persistence/src/main/java/com/sixsq/slipstream/persistence/Parameterized.java
	jar-service/src/main/java/com/sixsq/slipstream/user/FormProcessor.java
Remove slf4j logging module from Okeanos connector.
Runtime substitution of collection implementation (HashMap to ConcurrentHashMap) doesn't work with hibernate - persisters will refuse to map the new collection to DB due to the change.
Print stack trace of any exception in describing instances on connectors.
Work with service parameters directly instead of a set of them.
Clear the collection of parameters explicitly. Runtime substitution of collection implementation (HashMap to ConcurrentHashMap) doesn't work with hibernate - persisters will refuse to map the new collection to DB due to the change.
Dependency on jclouds-slf4j no longer needed, because we removed slf4j logging module from Okeanos connector.
Removed hibernate3 maven plugin. There is no real need to generate DB schema .ddl file during the build time as it is not used anywhere. Instead, persistence.xml uses hibernate.hbm2ddl.auto with respective RDBMS driver and coordinates to update DB at the service startup.
Merge branch 'master' of github.com:slipstream/SlipStreamServer

Conflicts:
	jar-service/src/main/java/com/sixsq/slipstream/user/FormProcessor.java
Removed commented out hibernate3 maven plugin.
Scoped test jar dependencies to the test scope.
Merge branch 'master' of github.com:slipstream/SlipStreamServer