fix `git init -g`

Closes #113

lib/hub/commands.rb

@@ -387,7 +387,7 @@ module Hub
     # > git remote add origin git@github.com:USER/REPO.git
     def init(args)
       if args.delete('-g')
-        url = git_url(github_user, repo_name, :private => true)
+        url = git_url(github_user, File.basename(current_dir), :private => true)
         args.after ['remote', 'add', 'origin', url]
       end
     end

test/hub_test.rb

@@ -502,6 +502,8 @@ class HubTest < Test::Unit::TestCase
   end
 
   def test_init
+    stub_no_remotes
+    stub_no_git_repo
     assert_commands "git init", "git remote add origin git@github.com:tpw/hub.git", "init -g"
   end