Extracted all attributes out to their own file

There were a number of attributes that were written in the same
file. Separating them out should help further refactoring and make
things more consistent

Author: iainbeeston

CHANGELOG.md

@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 - All limit classes are now stored in their own files in 'json-schema/attributes/limits'
+- All attribute classes are now stored in their own files in 'json-schema/attributes'
 
 ### Fixed
 - Corrected the draft6 schema id to `http://json-schema.org/draft/schema#`

lib/json-schema/attributes/dependencies.rb

@@ -34,11 +34,5 @@ def self.accept_value?(value)
         value.is_a?(String) || value.is_a?(Array) || value.is_a?(Hash)
       end
     end
-
-    class DependenciesV4Attribute < DependenciesAttribute
-      def self.accept_value?(value)
-        value.is_a?(Array) || value.is_a?(Hash)
-      end
-    end
   end
 end

lib/json-schema/attributes/dependencies_v4.rb

@@ -0,0 +1,11 @@
+require 'json-schema/attributes/dependencies'
+
+module JSON
+  class Schema
+    class DependenciesV4Attribute < DependenciesAttribute
+      def self.accept_value?(value)
+        value.is_a?(Array) || value.is_a?(Hash)
+      end
+    end
+  end
+end

lib/json-schema/attributes/properties.rb

@@ -62,13 +62,5 @@ def self.validate(current_schema, data, fragments, processor, validator, options
         end
       end
     end
-
-    class PropertiesV4Attribute < PropertiesAttribute
-      # draft4 relies on its own RequiredAttribute validation at a higher level, rather than
-      # as an attribute of individual properties.
-      def self.required?(schema, options)
-        options[:strict] == true
-      end
-    end
   end
 end

lib/json-schema/attributes/properties_v4.rb

@@ -0,0 +1,13 @@
+require 'json-schema/attributes/properties'
+
+module JSON
+  class Schema
+    class PropertiesV4Attribute < PropertiesAttribute
+      # draft4 relies on its own RequiredAttribute validation at a higher level, rather than
+      # as an attribute of individual properties.
+      def self.required?(schema, options)
+        options[:strict] == true
+      end
+    end
+  end
+end