Send sign up a new user notify mail to system admin
Fix to the correct meaning comment
Extract common logic as apply_omniauth
Add a mail setting params template
Add service name to subject
Add welcome page to root path
Guest user can see public projects
Align right a link to the function of changing the state of the user
Move import link from home#index to projects#index

Because the link is related to the project
Extract common logic as `visible` scope
Change undesirable method name

Because it does not represent the difference between the contents of the method in the "modify" and "update".
Confirm github repository presence through github api
Tweak project form design

Tweak open range design
Merge pull request #95 from kmiyake/iss-90

ユーザー登録があったとき管理者に通知メールを送る
Merge pull request #101 from kmiyake/iss-100

#99, #100 トップページの表示を切り替え、ゲストユーザーが公開プロジェクトを確認できる
Merge pull request #102 from kmiyake/iss-98

プロジェクトへgithubレポジトリを登録する時にレポジトリの妥当性を確認する