Add frozen_string_literals pragma

Author: jcoyne

.travis.yml

@@ -16,8 +16,6 @@ matrix:
       env: "RAILS_VERSION=4.2.5"
     - rvm: 2.2.4
       env: "RAILS_VERSION=4.2.5"
-    - rvm: 2.2.4
-      env: "RAILS_VERSION=edge"
     - rvm: jruby-9.0.4.0
       env: "RAILS_VERSION=4.2.5 JRUBY_OPTS=\"-J-Xms512m -J-Xmx1024m\""
   allow_failures:

app/controllers/bookmarks_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class BookmarksController < CatalogController  
 
   include Blacklight::Bookmarks

app/controllers/catalog_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CatalogController < ApplicationController  
 
   include Blacklight::Catalog

app/controllers/concerns/blacklight/base.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Blacklight::Base
   extend ActiveSupport::Concern
 

app/controllers/concerns/blacklight/bookmarks.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # note that while this is mostly restful routing, the #update and #destroy actions
 # take the Solr document ID as the :id, NOT the id of the actual Bookmark action.
 module Blacklight::Bookmarks

app/controllers/concerns/blacklight/catalog.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Blacklight::Catalog
   extend ActiveSupport::Concern
 

app/controllers/concerns/blacklight/controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Filters added to this controller apply to all controllers in the hosting application
 # as this module is mixed-in to the application controller in the hosting app on installation.
 module Blacklight::Controller

app/controllers/concerns/blacklight/default_component_configuration.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Blacklight
   module DefaultComponentConfiguration
     extend ActiveSupport::Concern

app/controllers/concerns/blacklight/facet.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Blacklight
   # These are methods that are used at both the view helper and controller layers
   # They are only dependent on `blacklight_config` and `@response`

app/controllers/concerns/blacklight/request_builders.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Blacklight
   module RequestBuilders
     extend ActiveSupport::Concern