Issue #5 review: this commit provides altogether with small code
clean-ups the requested deployment validation in #5 by @carlosbarragan.

Details:
 - Validating correct dependency configuration in the deployment
process.
 - Refactored observed methodes in BeanTestExtension
 - Disabled TestInvalidInjectionPointConfiguration. The test case
contains the reason.
 - Updated snapshot version
 - various cleanups