update

This pull request adds preliminary client support for ArcGIS Server layer preview, basic support for ISO 19115/19139 XML metadata, adds autocomplete for originators, contains some bug fixes: the search button in advanced search sometimes didn't work.  weird search results would appear if a search was fired before the map was loaded.  share cart wouldn't work for more than 10 layers, since solr returns 10 results per page by default.