Remove unused import statement.
(refs #90)Display validation error message for Default Branch.
Fix default smtp port in constant.
(refs #10) Completed notification implementation.
(refs #10) Add notification. Notification of when merging is not
implemented yet.
Fix a problem in pull request to branches other than the master branch.
Make configurable data(git,db) dir using env vars
Merge pull request #93 from tanacasino/feature/configurable-data-dir-2

Make configurable data(git,db) dir using env vars
Set init parameters using ServletContext#setInitParameter().
Don't set response content type via Accept header.
(refs #10) Add notification of when merged.
Update README.md
(refs #10) Except group account in notification.
Merge branch 'master' of https://github.com/takezoe/gitbucket.git
Update README.md
Update README.md
Merge branch 'master' into webhook