Added functional OrientDBDatabase, example data and config

This can be tested by constructing a classpath with orient-commons, orientdb-core, orientdb-client,
orientdb-jdbc, orientdb-enterprise, and googlecode/concurrentlinkedhashmap-lru, along with
duke and lucene, creating an orient database using the countries-both-orient.create script,
and then running Duke with arguments
    --noreindex --progress --showmatches ../../larsga/Duke/countries-orient.xml

The purpose of this example is to demonstrate using an already populated Database as both the
source of datasets to link and as the Duke database used to retrieve candidate matches.

One could additionally create a listener to insert edges into the same database, if one were so inclined.