New Test CreateStackServiceActionTest.java and changes on CloudProcessResource.java exec
Restored the stackExpose method and the addRelation method
Added, in the exec method of CloudProcessResource.java,a line to check if the StackServiceAction is not canceled and can receive a new Stack.
Merge pull request #16 from n3phele/exec_refactor

New Test CreateStackServiceActionTest.java and changes on CloudProcessRe...