make tests pass under travis.

sudo tests were failing under travis because they were not
being run as root.  this change runs the root tests as root,
and chowns the tests' "tmp" directory back to the original
user to allow the subsequent 'realworld' tests to pass.

Rakefile

@@ -12,6 +12,10 @@ rescue
   false
 end
 
+def sudo_task(task)
+  system("sudo -E rake #{task}")
+end
+
 namespace :spec do
   desc "Ensure spec dependencies are installed"
   task :deps do
@@ -117,7 +121,8 @@ begin
       Rake::Task["spec:rubygems:#{rg}"].reenable
 
       puts "\n\e[1;33m[Travis CI] Running bundler sudo specs against rubygems #{rg}\e[m\n\n"
-      sudos = safe_task { Rake::Task["spec:rubygems:#{rg}:sudo"].invoke }
+      sudos = sudo_task "spec:rubygems:#{rg}:sudo"
+      chown = system("sudo chown -R #{ENV['USER']} #{File.join(File.dirname(__FILE__), 'tmp')}")
 
       Rake::Task["spec:rubygems:#{rg}"].reenable