Fix site perms template error in admin logout.
Update notes in the project_template's urls.py describing how the homepage object should not be assigned to any menu templates.
Merge
Add new field Displayable.in_sitemap which appears in the meta data section of each admin form, and controls whether the object appears in sitemap.xml. Closes #499.
Added several new sites to list in README
Merge branch 'master' of git://github.com/stephenmcd/mezzanine into limit-search