[misc] Upgraded SolrJ version.
Issue #33: Add JQPL to Solr query translator
Added support for named parameters.
Issue #19: Create an abstraction layer for managing JPQL queries
Updated query to return a subset of entity fields.
Issue #33: Add JQPL to Solr query translator
Created an adapter class for mapping VariantRecord objects to Solr documents.
Issue #33: Add JQPL to Solr query translator
First attempt to integrate the JPQL to Solr translator with JPQL abstraction layer.
[misc] Fixed tests.