Add #should_render_field? support for all solr field types (index, show,
sort, search, facets).

Solr fields support :if and :unless configuration, e.g.

  config.add_index_field if: false
  config.add_index_field if: :some_helper_method
  config.add_index_field if: lambda { |solr_field, document| false }
  config.add_index_field unless: true
Add pt-BR translation

h/t Fabio Martinelli
Merge pull request #854 from projectblacklight/akretion-master

Add pt-BR translation
Merge pull request #853 from projectblacklight/if-unless

Add #should_render_field? support for all solr field types (index, show,
Add api documentation about return values of SolrHelper methods
Deprecation SolrHelper#get_single_doc_via_search
Deprecate SolrHelper#get_facet_pagination
Merge pull request #859 from projectblacklight/deprecate_get_facet_pagination

Deprecate SolrHelper#get_facet_pagination
Merge pull request #857 from projectblacklight/deprecate_single_doc

Deprecation SolrHelper#get_single_doc_via_search
Merge pull request #856 from projectblacklight/doc_solr_helper

Add api documentation about return values of SolrHelper methods
update travis to test against rails 4.1.0.rc2
add SolrResponse#documents to translate solr response documents to a blacklight::solr::document model
Extract SolrDocument references from controllers and models and define
the solr document class to use in the blacklight configuration.

- add blacklight_config.solr_document_model configuration (defaults to
  SolrDocument)
- make Bookmarks polymorphic and refactor Bookmarks to use objects
  instead of passing IDs around
Merge pull request #860 from projectblacklight/rails41rc2

update travis to test against rails 4.1.0.rc2
Merge pull request #855 from projectblacklight/solr-document-class

Extract explicit SolrDocument class references to make the model class configurable
Move force_to_utf8 from SolrHelper to SolrResponse
Merge pull request #858 from projectblacklight/encapsulate_force_to_utf8

Move force_to_utf8 from SolrHelper to SolrResponse
Bookmarks#index .endnote format

Sorry, I know this ought to have tests, but I'm unable to get BL tests
to run at all right now, and also confused about the best way to write
a test for this functionality.

Also add endnote link to bookmarks tools iff at least one doc has
an endnote export.
Bookmarks#export action

Special export action which does not require a login, but takes
an encrypted-and-signed user_id. Used for refworks callback url
for exporting bookmarks to refworks.
Bookmarks includes an export to refworks button

Only if at least one of the items on current page can
be exported in the format we're currently using to export
to refworks.