More contribution guidelines
Add autodie and overloading to highlighted pragmas
Fix build-corpus.pl to work on fresh checkouts
Improve CONTRIBUTING wrt. tests
Add contrib script for highlighting all pragma-like modules as such
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Add contrib script for highlighting all pragma-like modules as such
  Improve CONTRIBUTING wrt. tests
  Fix build-corpus.pl to work on fresh checkouts
  Add autodie and overloading to highlighted pragmas
  More contribution guidelines