API Added geo search on solr search page

* Added geo spatial options for geo-restriction of results on SolrSearchPage
* Moved parts of SolrSearchPage to SolrQueryBuilder so that things like sorting
  are part of the query building process, not manually applied to a params
  array
* Fixed some issues with the indexing process to make clear distinction between
  Live and Stage by retrieving the right content from Versioned:: methods