* Fixed some errors in RankedSearchImpl and added a default parameter to the interface.
* Added a RankedSearch test suite.
* Cleaned up part of the test application. (memory leaks)
Merge branch 'unit_test' of https://github.com/johnmangan/cards into unit_test

* Removed SQLLite implementation of AssetMetadataMapping module from the CMakeLists.txt so that we can build.

Conflicts:
	test/tests.cpp