Updates Gemfile.lock after bundle install.
Includes Hydra::Solr::Document in SolrDocument class. This essentially just mixes in SolrDocument#to_solr, which causes the view helper methods `render` and `link_to_document` to generate the correct links.
Adds `as:` option to routing for "series", "program", "video", and "audio" routes, which is key in getting the series_path, program_path, video_path, and audio_path helpers to work, which are used in Blacklight's `link_to_document` helper.
Removes BlacklightHelper#docunent_path, a workaround no longer needed because of the SolrDocument#to_solr method and changes to the routes (see above).
Replaces call to `link_to` with `link_to_document` in the Blacklight "more like this" partial. Not even sure if we will keep this, but this gets it to not throw errors. 
Removes a bunch of commented out stuff from partial "catalog/document_list".
Adds the partials for the different types of things displayed in the "catalog/document_list" partial, namely "series", "program", "video", "audio".
Removes partial "catalog/document", as it is now up to the newly added partials for that display logic.
Adds "asset_date" as part of the solr document.