LUN-1687: added new abstract blog that will respond to /blogs/.
+ refactored code so that we can reuse common pieces from abstract blog.
LUN-1687 - implemented
* home blog admin permissions
* nav tool enabled
* showing home blog nav nodes
* home blog add & change forms
LUN-1687: moved entry-related actions from blog admin to blog entry admin.
LUN-1687: layout inline is now availble for super landing page
LUN-1687: users should see home blogs only for sites they have permissions on.
LUN-1687: fixed home blog admin permissions
LUN-1687: added help text for new forms
LUN-1687: fixed entry template so that they use their blogs settings and not the blog passed in the context; Added home blog to default /blogs/ view.
* fixed tests
* super landing page url should be displayed in sitemaps
* sitemap perf improvement: select-related on blog since all blog related pages use the associated blog slug in their absolute url
Merge pull request #49 from pbs/LUN-1687

Lun 1687