This ensures that recipes can simply be opened and built in-place using
C-c C-c, even if package-build had previously been initialized with a
different base directory.
See https://github.com/cask/cask/issues/236
The original major mode for JAPE files doesn't appear to have been
updated since 2005 is very feature incomplete. The original version was
also GPL licensed, but I can't find a copy of it online anymore. This is
an update to that original jape-mode that is more modern and under
active development.