Close issues via commit messages
Merge branch 'master' into closing-issues-via-commit-messages

Conflicts:
	src/main/scala/app/PullRequestsController.scala
	src/main/scala/servlet/GitRepositoryServlet.scala
Merge branch 'closing-issues-via-commit-messages' of https://github.com/odz/gitbucket into odz-closing-issues-via-commit-messages
(refs #218)Separate StringUtil#extractCloseId() to add unit test.
Merge branch 'odz-closing-issues-via-commit-messages'