add OpenStructWithHashAccess#each
Remove :escape_label and :escape_value support from the constraints element
remove documentFunctions option from #render_show_doc_actions
merge locals into render call in #render_document_index
tidy up blacklight helpers
Blacklight::Solr::Document#to_param should return a string to work with rails routing.

Fixes #638
Generate a stub config/locales/blacklight.yml.en into the application; fixes #558
Merge pull request #751 from projectblacklight/helpers-cleanup

Helpers cleanup