[core] removing uuidtools dependency; added Fog::UUID class

fog.gemspec

@@ -51,7 +51,6 @@ Gem::Specification.new do |s|
   s.add_dependency('nokogiri', '~>1.5')
   s.add_dependency('ruby-hmac')
   s.add_dependency('unicode', "~> 0.4.4")
-  s.add_dependency('uuidtools', ">= 2.1.0")
 
   ## List your development dependencies here. Development dependencies are
   ## those that are only needed during development

lib/fog/core.rb

@@ -31,6 +31,7 @@ require 'fog/core/time'
 require 'fog/core/timeout'
 require 'fog/core/wait_for'
 require 'fog/core/class_from_string'
+require 'fog/core/uuid'
 
 # data exchange specific (to be extracted and used on a per provider basis)
 require 'fog/xml'

lib/fog/core/uuid.rb

@@ -0,0 +1,21 @@
+require 'securerandom'
+
+module Fog
+  class UUID
+    class << self
+
+      def uuid
+        if supported?
+          SecureRandom.uuid
+        else
+          raise "UUID generation is not supported by your ruby implementation. Please try upgrading to Ruby 1.9.x."
+        end
+      end
+
+      def supported?
+        SecureRandom.respond_to?(:uuid)
+      end
+
+    end
+  end
+end

tests/core/uuid_tests.rb

@@ -0,0 +1,16 @@
+Shindo.tests('Fog::UUID', 'core') do
+
+  tests('supported?').succeeds do
+    Fog::UUID.supported? == SecureRandom.respond_to?(:uuid)
+  end
+
+  if Fog::UUID.supported?
+    tests('success').succeeds do
+      Fog::UUID.uuid =~ /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/
+    end
+  else
+    tests('success').succeeds do
+      raises(RuntimeError) { Fog::UUID.uuid }
+    end
+  end
+end