Make debugger dependency only for ruby platforms

rack-attack.gemspec

@@ -26,6 +26,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'activesupport', '>= 3.0.0'
+  s.add_development_dependency 'debugger', '~> 1.5' unless RUBY_PLATFORM =~ /java/
   s.add_development_dependency 'redis-activesupport'
   s.add_development_dependency 'dalli'
 end

spec/spec_helper.rb

@@ -5,9 +5,14 @@ require "minitest/autorun"
 require "minitest/pride"
 require "rack/test"
 require 'active_support'
-
 require "rack/attack"
 
+begin
+  require 'debugger'
+rescue LoadError
+ #nothing to do here
+end
+
 class Minitest::Spec
 
   include Rack::Test::Methods