Fixed: find_cucappIdentifier just works with cucappIdentifier

Previously, when looking for an object, we could only find an object with its cuccappIdentifier.
Now the method find_cucappIdentifier has been replaced by the method find_control(aKey, aValue).
This method will print every controls relative ot the given key and value.
Merge pull request #19 from Dogild/findControlImprovement

Fixed: find_cucappIdentifier just works with cucappIdentifier