first stab at introducing  a solr document service
introduce getTextSnippetFromSolr method in ArticleService
stubbed out tests needed for service
fixed bug in SolrDocumentService and implement getTextSnippetFromSolr in ArticleMetaDescription extension
Merge branch 'SolrDocumentService' into crosswiki-queryservice
successfully implement cross-wiki search against dev-search, with a heaping helping of technical debt