Categories now available in entry change form.
Added custom settings that is used to fetch allowed sites for users for specific models.
local storage for blog thumbnails without filer
Users should not be allowed to add/change/delete entries from blogs where they are not allowed.
Merge remote-tracking branch 'origin/master' into LUN-1483

Conflicts:
	cms_blogger/models.py
	cms_blogger/settings.py
Blog Landing Page view now available. Also, added custom entry manager.
working on removing old file if new file is uploaded
menged abstract and meta description fields. only short description field is required.
Moved entry form fields around.
overwrite previous file
Re-arranged entry change form fields.
need to pass id to widget; done on frontend
upload url works
Added save & publish buttons in the entry change form.
Added content preview buttons for blog entry changeform.
upload file, show its thumnail; needs work
add a single image, as opposed to filer where you can add many
Added promotion plugin; added landing page pagination;
Fixed prev&next posts for entry page;
Added modification date for entries which may be useful in the future;
Added links for blog header to point to the landing page
Implemented Digg-style pagination on landing page.