Changes

<h5h6>2.2.1 Define the internal implementation class (This the class BookFinderImplementation <u>will not be exposed to the outside world</u>)</h5h6>

The bundle export the package cs.ecl.osgi.simple.bookfinderservice <strong>Meanwhile, the implementation package - cs.ecl.osgi.simple.bookfinderservice.internals - <strong>is hidden to the outside world and can be change dynamically</strong>and can be changed dynamically anytime a better implementation is created.