#110 implement multi-blog feature / multi site sections

[Jayesh Sheth]

It would be able to have several blogs-within-a-blog,
or site sections within a site.

It should be easy to add a new blog-within-a-blog
(admin panel ui) and the display of the new blog / site
section should be easily customizable (i.e. links blog
/ side blog / rss feed blog / song blog / tip blog ).

There should be a drop down box on the main admin panel
page (Create / Edit entries) where one can choose which
blog / site section to edit.