Add checkin/checkout feature, excludes credit deduction.

* Add admin menu entry to transaction history and access log.
Add `access` table.
Change `transactions` table to add price field.

* Minor changes to member info and transaction history page.
Charge credit when user checkout.
Add member info page.

* '/' uri auto route to admin/member page.
Add transaction listing for member.
Display member access log, member can also checkin/checkout.
Member can self-update info.