Give better example for hand-written script=

[kentfredric]

as per IRC:

1. Using weird parameters to make don't work
2. Blobs like this in script: give the wrong result.

before_install:
  - eval $(curl https://travis-perl.github.io/init) --auto
script:
  - perl Makefile.PL
  - make
  - prove -lv $(test-dirs)

[haarg]

It's unlikely that a script as shown could be made to work fully. The coverage handling needs to know when the test run ends, and there isn't really any way to detect that given an arbitrary script. But it could be adjusted to work better when you are using make test with extra parameters.