Work on store interface

* Removed stubs that will not be implemented any time soon
* Simplified test cases
* Provide access to DescriptionMatchFinder functionality via the public interface

Change-Id: Iffea17e8728d1719d7d61597d86ba3d40bbd5820
Rem verbose GPL headers

Change-Id: Ic961bd27cf9603ac0016cb418b7e926bc4188d23
Add docs to readme

Change-Id: I0a7acaae664545084582b45300381b22d8b13637