[Catalyst] C::P::Static::Simple patch, new config option "ignore_dir_extensions"

Attached is a patch to add a new "ignore_dir_extensions" option.

At present, if I want to allow all files within root/static to be
served, I have to set
ignore_extensions = []
which means that all files in all folders will be served.

This new option would allow me to set
ignore_dir_extensions = { static => [] }
which would mean that all files within root/static would be served,
yet other directories will still use the default "ignore_extensions"
setting.

Cheers,
Carl