initial skeletons for individual connectors
move code into new locations
build with tests working
remove dependencies provided by server from RPM package
Refactor authz strategy
Embeds the authz in the same table
Introduces the Guarded interface
Requires db migration
Merge branch 'master' into issue_186

Conflicts:
	jar-connector/src/test/java/com/sixsq/slipstream/run/RunTestBase.java
add libcloud and stratuslab dependencies to connectors
Merge branch 'master' into issue_186
Merge branch 'master' of https://github.com/slipstream/SlipStreamServer
Merge branch 'master' into issue_186
fix version numbers of submodules
Merge branch 'master' into issue_186
Avoid NPE by validating entity.  Provide meaningful error messages to the user and log them as well.
Merge branch 'master' of https://github.com/slipstream/SlipStreamServer
Merge branch 'master' into issue_186
Merge pull request #197 from slipstream/issue_186

reorganize the connector layout in preparation for move to separate repository
remove connector code from repository; moved to SlipStreamConnectors (#186)
do not include connectors in war file (#186)
Update parent version for release
[maven-release-plugin] prepare release SlipStreamServer-2.3.1