Use immutable support gem

.rspec

@@ -1,2 +1,2 @@
 --color
---fail-fast
+#--fail-fast

Gemfile

@@ -2,8 +2,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-# For Veritas::Immutable, will be extracted soon
-gem 'veritas', :git => 'https://github.com/dkubb/veritas'
+gem 'immutable', :git => 'https://github.com/mbj/immutable'
 
 # Until there is a release with explicit sends to self fix
 gem 'to_source', :git => 'https://github.com/mbj/to_source'

lib/mutant.rb

@@ -1,6 +1,4 @@
-# For Veritas::Immutable. will be extracted soon
-require 'veritas'
-
+require 'immutable'
 require 'securerandom'
 require 'to_source'
 require 'ice_nine'
@@ -38,6 +36,7 @@ end
 require 'mutant/support/abstract'
 require 'mutant/random'
 require 'mutant/runner'
+require 'mutant/runner/rspec'
 require 'mutant/mutator'
 require 'mutant/mutator/registry'
 require 'mutant/mutator/literal'

lib/mutant/context.rb

@@ -1,7 +1,7 @@
 module Mutant
   # An abstract context where mutations can be appied to.
   class Context
-    include Veritas::Immutable
+    include Immutable
     extend Abstract
 
     # Return root ast for mutated node

lib/mutant/context/constant.rb

@@ -2,7 +2,7 @@ module Mutant
   class Context
     # Constant context for mutation (Class or Module)
     class Constant < Context
-      include Veritas::Immutable
+      include Immutable
 
       private_class_method :new
 

lib/mutant/matcher/method.rb

@@ -2,7 +2,7 @@ module Mutant
   class Matcher
     # Matcher to find AST for method
     class Method < Matcher
-      include Veritas::Immutable
+      include Immutable
 
       # Parse a method string into filter
       #

lib/mutant/matcher/method/classifier.rb

@@ -3,7 +3,7 @@ module Mutant
     class Method < Matcher
       # A classifier for input strings
       class Classifier
-        extend Veritas::Immutable
+        extend Immutable
 
         TABLE = {
           '.' => Matcher::Method::Singleton,

lib/mutant/mutator.rb

@@ -1,7 +1,7 @@
 module Mutant
   # Generator for mutations
   class Mutator
-    include Veritas::Immutable
+    include Immutable
     extend Abstract
 
     # Enumerate mutations on node

lib/mutant/runner.rb

@@ -1,7 +1,7 @@
 module Mutant
   # Abstract runner for tests
   class Runner
-    include Veritas::Immutable
+    include Immutable
     extend Abstract
 
     # Run runner

lib/mutant/subject.rb

@@ -1,7 +1,7 @@
 module Mutant
   # Subject for mutation wraps AST to mutate with its Context 
   class Subject
-    include Veritas::Immutable, Enumerable
+    include Immutable, Enumerable
 
     # Return context
     #