Restructure: Fix imports in budget_categories.
Restrucure: Fix imports on events.py.
Kits: Fix imports.
Restructure: API -Fix imports on parts.
Restructure: Fix photos imports.
Restructure: Fix imports in posts.py.
Restructure: Fix imports on receipts.
Restructure: Fix imports on reimbursements.
Restructure: Fix imports on tags.
Restructure: Fix imports on time_slots.
Posts: Fix import of current_user
Restructure: Fix imports on transactions.
Restructure: Fix imports on users.
Restructure: Fix imports on views.
Restructure: Fix imports on voting.
Restructure: PEP8.