plack/Plack — pull request #398 by maio (2013-04-25 08:39:16+00:00)
Title: Make restarter ignore Emacs lock files

which are being created when user modifies some file.

Emacs creates symbolic link in same directory as modified file and
prepends ".#" to the file name.

So when user edits /some/path/Foo.pm Emacs creates /some/path/.#Foo.pm

http://www.gnu.org/software/emacs/manual/html_node/emacs/Interlocking.html