restoring CMS url references

Restore the patterns for CMS url's that are referenced in the templates.  These were removed prematurely in preparation for moving the viewshare.org site specific branding, etc. into the viewshare_site repository.

With the exception of userguide and augment_patterns, these are only referenced in the site_base.html template.  Ideally, we would provide a simple version of this in viewshare, with the viewshare_site repository overriding this with the correct links and branding.