Drop express test

Author: chorrell

spec/npm_tests.rb

@@ -16,8 +16,4 @@ def test_npm
   describe command("echo \'{\"foo\":\"bar\"}\' | json foo") do
     its(:stdout) { should match /bar/ }
   end
-
-  describe command('npm install express') do
-    its(:exit_status) { should eq 0 }
-  end
 end