move blog entries to a blog

* moves blog entries
* creates categories if necessary
* removes categories if it doesn't have any entries left
minor stuff
merge with master
increment duplicate slug when moving entry; +tests
test with saved entries, and one draft entry
Merge branch 'master' into LUN-1446-move-blogentries

also remove category lister in change_list used for debugging purposes

Conflicts:
	cms_blogger/admin.py
don't use post_data; add tests for redundant moves
rename blogentries to entries
don't use post_data; don't use redundant list()
refactoring tests; +pep8
don't test entries.exists(), entries could be []

when no blogentries are selected for moving an empty list is returned instead
of an EmptyQuerySet
test move nothing; pep8 forms.py
don't allow regular users to move entries; +tests
Merge branch 'master' into LUN-1446-move-blogentries
improve query for getting categories names and ids
Merge pull request #16 from pbs/LUN-1446-move-blogentries

LUN-1446 move blogentries