Show members(nickname & image) on top page
Show button to go Vote#new
Do not consider empty members
Specify the image size by option of image_tag method
Change vote button to text link
Merge pull request #47 from yochiyochirb/members-and-vote-button-in-top

TOP 画面( Member#index )にメンバー一覧と遷移ボタンを表示させる #30