Add Fabricate.clear_singletons! utility method

Closes #7

LGTM given by: @marten

Squashed commit of the following:

commit 1f1b31c9
Author: Samuel Esposito <s.esposito@roqua.nl>
Date:   Mon Jun 16 22:46:08 2014 +0200

    update change log

commit 0e59e142
Author: Samuel Esposito <s.esposito@roqua.nl>
Date:   Mon Jun 16 22:38:00 2014 +0200

    add clear_singletons! method

CHANGELOG.md

+## 0.1.9 / 2014-06-18
+
+* add Fabricate.clear_singletons! utility method
+
 ## 0.1.8 / 2014-06-17
 
 * catch Mysql2 errors

Gemfile.lock

 PATH
   remote: .
   specs:
-    roqua-support (0.1.8)
+    roqua-support (0.1.9)
       activesupport (>= 3.2, < 5.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.1.0)
+    activesupport (4.1.1)
       i18n (~> 0.6, >= 0.6.9)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
@@ -43,7 +43,7 @@ GEM
       rb-inotify (>= 0.9)
     lumberjack (1.0.4)
     method_source (0.8.2)
-    minitest (5.3.3)
+    minitest (5.3.5)
     nio4r (1.0.0)
     pry (0.9.12.6)
       coderay (~> 1.0)
@@ -66,7 +66,7 @@ GEM
     thor (0.18.1)
     thread_safe (0.3.4)
     timers (1.1.0)
-    tzinfo (1.1.0)
+    tzinfo (1.2.1)
       thread_safe (~> 0.1)
 
 PLATFORMS

lib/roqua-support/version.rb

 module Roqua
   module Support
-    VERSION = "0.1.8"
+    VERSION = "0.1.9"
   end
 end

lib/roqua/core_ext/fabrication/singleton.rb

 class Fabricate
-  @singletons = {}
-
   def self.singleton(name, options={}, &block)
     @singletons[name] ||= Fabricate(name, options={}, &block)
     return @singletons[name]
   end
-end
\ No newline at end of file
+
+  def self.clear_singletons!
+    @singletons = {}
+  end
+
+  clear_singletons!
+end

spec/roqua/core_ext/fabrication/singleton_spec.rb

@@ -12,5 +12,11 @@ describe Fabricate do
   it 'maintains multiple singletons' do
     Fabricate.singleton(:one).should_not == Fabricate.singleton(:two)
   end
+
+  it 'clears singletons' do
+    the_one = Fabricate.singleton(:one)
+    Fabricate.clear_singletons!
+    expect(Fabricate.singleton(:one)).not_to eq(the_one)
+  end
 end