Update changelog

--HG--
extra : source : a2ee2543453df5d02eb33b554746afaf1390763c
Add south to allow for easier database schema migrations
Set the order of sets when adding them
Split the views from the manager app into individual files

--HG--
rename : wger/manager/views.py => wger/manager/views/day.py
rename : wger/manager/views.py => wger/manager/views/log.py
rename : wger/manager/views.py => wger/manager/views/misc.py
rename : wger/manager/views.py => wger/manager/views/set.py
rename : wger/manager/views.py => wger/manager/views/setting.py
rename : wger/manager/views.py => wger/manager/views/user.py
rename : wger/manager/views.py => wger/manager/views/workout.py
If there are no other sets, order__max will be None, check for that
First commit to add support for 'human friendly' weight units

When creating a nutrition plan, the user should be able to user more
human friendly weight units, like '1 slice' or 'half a cup' instead of
having to know the exact amount in grams.
Add missing init file
Add more views and tests for the weight unit model
Remove active_tab, this is done with a context processor
Add views and tests to add weight units to ingredients