Display ticket number

Amend to get current_user before filter
Amend header
Amend Giron button
Refactor DB schema

Bugfix authenticate loop
Amend to decrease ticket_num when creating rounds
Add user debating lists
Amend round-list button

Add top page link
Add logout, profile button to the header.
Merge pull request #37 from shimokawa-naoki/topic_index_page_UI

Topic index page UI