mode for ~/.config/hub is 0600 now

Fixes #120

features/authentication.feature

@@ -22,6 +22,7 @@ Feature: OAuth authentication
     And the output should contain "github.com password for mislav (never stored):"
     And the exit status should be 0
     And the file "../home/.config/hub" should contain "oauth_token: OTOKEN"
+    And the file "../home/.config/hub" should have mode "0600"
 
   Scenario: Ask for username & password, re-use existing authorization
     Given the GitHub API server:

features/steps.rb

@@ -124,3 +124,10 @@ Then /^there should be no "([^"]*)" remote$/ do |remote_name|
   remotes = run_silent('git remote').split("\n")
   remotes.should_not include(remote_name)
 end
+
+Then /^the file "([^"]*)" should have mode "([^"]*)"$/ do |file, expected_mode|
+  prep_for_fs_check do
+    mode = File.stat(file).mode
+    mode.to_s(8).should =~ /#{expected_mode}$/
+  end
+end

lib/hub/github_api.rb

@@ -297,7 +297,7 @@ module Hub
 
       def save
         FileUtils.mkdir_p File.dirname(@filename)
-        File.open(@filename, 'w') {|f| f << YAML.dump(@data) }
+        File.open(@filename, 'w', 0600) {|f| f << YAML.dump(@data) }
       end
     end