set login_required for all budget urls, added minimal login template
Added family app
Merge branch 'master' into trunk
initial south migration fixes done on master; taking them here to continue work on authentication
cleaned up old migrations
Added FamilyMember profile model
Added family pk to url, no filtering yet
changed family from url to session. Filtering in budget detail view
Filtered parent field on CategoryForm
Filter copy from in BudgetForm
Show 10 last transactions in accounting view
Added Registration form and an empty profile page