Remove conflicting 'listen' directives from sphinx.conf
Adds 'binlog_path' to sphinx configuration
Removes SOLR code fom downloader

Since the index will now be done on sphinx (and in batch via a cronjob) we
don't need the indexing code on downloader.
Removes Solr related code from feedfinder
Adds article URL and summary as atrributes on the indexed article
Adds feed URL as an attribute to the indexed feed
Increases max_matches in the server
Removes all Solr related code from repository (except for the Monitoring app)
Adds newline to requirements.txt
Updates README to reflect the change from Solr to Sphinx
Merge branch 'feature/sphinx'