Merge pull request #183 from grosser/rake

make bundle && bundle exec rake work so we do not need an explanation of...

Gemfile

 source "http://rubygems.org"
 
 gemspec
+
+gem "rake"

Rakefile

+task :default do
+  sh "cd test && ruby test.rb"
+end

test/README.md

 ## Testing
 
-Run `ruby test.rb`.
+Run `rake` or if you want to avoid bundler `cd test && ruby test.rb`.
 
 This runs Brakeman against full apps in the `apps` directory and checks the results against what is expected.
 
 ## Test Generation
 
-Run `ruby to_test.rb apps/some_app > tests/test_some_app.rb` to generate a test suite with tests for each warning reported.
+Run `cd test && ruby to_test.rb apps/some_app > tests/test_some_app.rb` to generate a test suite with tests for each warning reported.