Load all formats using glob

Previously we had to explicitly load attributes before formats, because
the format classes weren't requiring their parent class. In effect there
was a coupling between the load order in json-schema.rb and the
individual format classes.

I've changed this so that each format requires it's parent class.

Author: iainbeeston

lib/json-schema.rb

@@ -14,6 +14,5 @@
 require 'json-schema/schema/reader'
 require 'json-schema/validator'
 
-Dir[File.join(File.dirname(__FILE__), "json-schema/attributes/*.rb")].each {|file| require file }
-Dir[File.join(File.dirname(__FILE__), "json-schema/attributes/formats/*.rb")].each {|file| require file }
+Dir[File.join(File.dirname(__FILE__), "json-schema/attributes/**/*.rb")].each {|file| require file }
 Dir[File.join(File.dirname(__FILE__), "json-schema/validators/*.rb")].sort!.each {|file| require file }

lib/json-schema/attributes/formats/custom.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 require 'json-schema/errors/custom_format_error'
 
 module JSON

lib/json-schema/attributes/formats/date.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 
 module JSON
   class Schema

lib/json-schema/attributes/formats/date_time.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 
 module JSON
   class Schema

lib/json-schema/attributes/formats/date_time_v4.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 
 module JSON
   class Schema

lib/json-schema/attributes/formats/time.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 
 module JSON
   class Schema

lib/json-schema/attributes/formats/uri.rb

@@ -1,4 +1,4 @@
-require 'json-schema/attribute'
+require 'json-schema/attributes/format'
 require 'json-schema/errors/uri_error'
 
 module JSON