Issue mbleigh#69: rails integration lazy loading

lib/princely.rb

@@ -17,7 +17,7 @@
 #
 require 'logger'
 require 'pathname'
-require 'princely/rails' if defined?(Rails)
+require 'princely/railtie' if defined?(Rails)
 
 module Princely
   autoload :StdoutLogger, 'princely/stdout_logger'

lib/princely/railtie.rb

@@ -0,0 +1,27 @@
+require 'princely/pdf_helper'
+
+module Princely
+  class Railtie < Rails::Railtie
+    initializer "princely.helper" do
+      if Mime::Type.lookup_by_extension(:pdf) != 'application/pdf'
+        Mime::Type.register 'application/pdf', :pdf
+      end
+
+      if ::Rails::VERSION::MAJOR >= 5
+        ActiveSupport.on_load(:action_controller) do
+          prepend Princely::PdfHelper
+        end
+      else
+        ActiveSupport.on_load(:action_controller) do
+          include Princely::PdfHelper
+        end
+      end
+      if (::Rails::VERSION::MAJOR == 3 && ::Rails::VERSION::MINOR > 0) ||
+        (::Rails::VERSION::MAJOR >= 4)
+        ActiveSupport.on_load(:action_controller) do
+          include Princely::AssetSupport
+        end
+      end
+    end
+  end
+end