[INCOMPATIBLE CHANGES]
- plackup foo.psgi will not search the file in @INC anymore before the current directory
See https://github.com/plack/Plack/pull/343 for details (miyagawa)
[NEW FEATURES]
- plackup --path /foo will mount the application under /path (mattn)
[BUG FIXES]
- AccessLog: Fix the timezon offset for certain timezones
- ErrorDocument: support streaming interface