Upgraded development dependencies:

- bundler - 1.13.1
- rake - 11.2.2
- rspec - 3.5.0
- rspec-rails - 3.5.2
- test-unit - 3.2
- mdl - 0.4
- rubocop - 0.42
- codeclimate-test-reporter - 0.6.0

config.gemspec

@@ -27,22 +27,22 @@ Gem::Specification.new do |s|
   s.add_dependency 'activesupport',           '>= 3.0'
   s.add_dependency 'deep_merge',              '~> 1.1.1'
 
-  s.add_development_dependency 'bundler',     '~> 1.11',  '>= 1.11.2'
-  s.add_development_dependency 'rake',        '~> 11.1',  '>= 11.1.2'
+  s.add_development_dependency 'bundler',     '~> 1.13',  '>= 1.13.1'
+  s.add_development_dependency 'rake',        '~> 11.2',  '>= 11.2.2'
 
   # Testing
   s.add_development_dependency 'appraisal',   '~> 2.1',   '>= 2.1.0'
   s.add_development_dependency 'rails',       '~> 5.0',   '>= 5.0.0.1'
-  s.add_development_dependency 'rspec',       '~> 3.4',   '>= 3.4.0'
-  s.add_development_dependency 'rspec-rails', '~> 3.4',   '>= 3.4.2'
-  s.add_development_dependency 'test-unit',   '~> 3.1',   '>= 3.1.7'
+  s.add_development_dependency 'rspec',       '~> 3.5',   '>= 3.5.0'
+  s.add_development_dependency 'rspec-rails', '~> 3.5',   '>= 3.5.2'
+  s.add_development_dependency 'test-unit',   '~> 3.2',   '>= 3.2.1'
   s.add_development_dependency 'sqlite3',     '~> 1.3',   '>= 1.3.11'
 
   # Static code analysis
-  s.add_development_dependency 'mdl',         '~> 0.3',   '>= 0.3.1'
-  s.add_development_dependency 'rubocop',     '~> 0.40',  '>= 0.40.0'
+  s.add_development_dependency 'mdl',         '~> 0.4',   '>= 0.4.0'
+  s.add_development_dependency 'rubocop',     '~> 0.42',  '>= 0.42.0'
 
   if ENV['TRAVIS']
-    s.add_development_dependency 'codeclimate-test-reporter', '~> 0.5.1'
+    s.add_development_dependency 'codeclimate-test-reporter', '~> 0.6.0'
   end
 end