Added auto-generated 'Examples/d/example.mk' to '.gitignore'.
Merge branch 'michael-schaller-gitignore'

* michael-schaller-gitignore:
  Added auto-generated 'Examples/d/example.mk' to '.gitignore'.
Fix javascript clean

Regression introduced a couple of commits ago
Fix D examples clean
Let Octave 3.8 fail in Travis

Too many internal compiler errors in gcc are failing the builds