python_2_unicode_compatible decorateur
Move future import to the top

All from __future__ imports have to be at the top of the file.
Merge pull request #338 from cXhristian/future-import-fix

Move future import to the top of the file
pep8
ignore wiki/attachments for now as it occurs from running tests and should not be distributed
initial tests for custom queryset methods
do not call get_empty_query_set, that's deprecated
add tests of none() and empty queryset functionality
Merge pull request #337 from fsx999/master

python_2_unicode_compatible decorateur
use gettext_lazy where appropriate, thanks @jluttine for starting work on this
add more tests of custom managers and add support for django 1.5 and 1.6's patterns for empty querysets
Fix #263 and style article list header
Fix #341
Adding python_2_unicode_compatible from @fsx999, #Fix 282 and Close #342

Conflicts:
	wiki/plugins/attachments/models.py
Fix notification error in settings

Article subsciptions was missing a .count()
Merge pull request #343 from cXhristian/settings-subscriptions-count

Fix notification error in settings
Fix broken markdown output when attachment does not exist
Fix not being able to add existing attachments to an article
Fix many issues with attachments caused by attachment-filter not being specifc enough
Clear cache for article when doing something with attachments