11800 login menu 2

This will swap out the custom "header menu" with system's "user menu", providing us with a "My account" link for logged in users.

Steps to test:
1) Download branch, and re-install agov.
2) Once installed, as a logged in user you should see these menu items in the top bar:
- Skip to content
- Sitemap and Feeds
- My Account
- Logout
3) As an anonymous user, you shouls see these menu items:
- Skip to content
- Sitemap and feeds
- Member login
4) Apperance wise, The links should look exactly the same as the do on the current demo.agov.com.au

This has been tested in ie7/8/9 Firefox, Chrome, Safari