Add in mockito dependency
Add Lucene querier classes for testing the indexer. We need to check whether an item was added to the index by querying it. This is the same code as the API querier, this should probably be separated out or something.
Create the actual tests for the LuceneIndexer. The first test simply adds two items and then queries the index to see if they are retrieved with a query. The second does that same but using the answers class.