Use shared directory path instead of marker

lib/sprig/configuration.rb

@@ -1,14 +1,14 @@
 module Sprig
   class Configuration
 
-    attr_writer :directory, :logger, :shared
+    attr_writer :directory, :logger, :shared_directory
 
     def directory
-      Rails.root.join(@directory || default_directory, environment_directory)
+      Rails.root.join(@directory || default_directory, source_directory)
     end
 
-    def shared
-      @shared ||= false
+    def shared_directory
+      @shared_directory
     end
 
     def logger
@@ -17,8 +17,8 @@ def logger
 
     private
 
-    def environment_directory
-      shared ? '' : Rails.env
+    def source_directory
+      shared_directory || Rails.env
     end
 
     def default_directory

spec/lib/sprig/configuration_spec.rb

@@ -18,16 +18,16 @@
     end
   end
 
-  describe "#shared" do
-    it "returns false by default" do
-      subject.shared.should == false
+  describe "#shared_directory" do
+    it "returns nil by default" do
+      subject.shared_directory.should == nil
     end
 
     it "returns a shared directory" do
-      subject.shared = true
+      subject.shared_directory = 'shared'
       subject.directory = 'seed_files'
 
-      subject.directory.to_path.should == '~/seed_files'
+      subject.directory.to_path.should == '~/seed_files/shared'
     end
   end