from the index page, render the search_sidebar partial instead of the facets partial directly to give applications a hook to modify the sidebar without overriding the whole index template.
Add friendly error page when no search results are found

Fixes #612
move default search_action_url helper into Blacklight::Controller, and add method docs about the feature.

Fixes #620
extract Blacklight::Base from Blacklight::Catalog, providing only the methods needed to use the blacklight helpers and partials
Merge pull request #613 from projectblacklight/zero-results-found

Add friendly error page when no search results are found
Merge pull request #621 from projectblacklight/issue-620

Make it easier to work with Blacklight outside of a Catalog-like controller
Merge pull request #615 from projectblacklight/search_sidebar_partial

from the index page, render the search_sidebar partial
JSON response from CatalogController#index can be overridden
Merge pull request #626 from projectblacklight/refactor_json_response

JSON response from CatalogController#index can be overridden
refactor search history logic so we're pulling search query parameters out of the database, not the session.
refactor previous/next docs to use only a single extra solr query.
pass around the current search id when linking to documents
raise poltergeist timeout under jruby.
move search history window into the blacklight_config.
split the search context controller methods into a separate module.
bump the default SearchHistoryWindow to 100
add search_context parameter to allow the full search context params to get passed in
require that the search-to-be-saved is in the user's search history.
Merge pull request #619 from projectblacklight/search-history-refactor

refactor search history logic so we're pulling search query parameters o...
add :document_counter to render_document_partial call in atom builder
so that index templates which use the 'document_counter' variable
don't cause errors in catalog#index atom-format view

From @ebenenglish
https://github.com/ebenenglish/blacklight/tree/add-doc-counter-to-atom-builder