Remove stages from Travis
Remove stages from Travis

Ensures that the "fast_finish" option is honored and that
"Allowed failures" is still listed as a separate block.

lovell/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips