Use the Avada Kedavra on vstrings

Signed-off-by: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
use travis helpers
don't need to build a dist first since we have no prereqs
Merge pull request #121 from haarg/travis-helpers

Travis helpers
v5.8.0 is the little engine that failed
Add vstrings.t to MANIFEST
Move the Travis notifications to #makemaker
Skip failing test in vstrings.t on < 5.8.0

I think it is a subtle bug in Test::More rather than related
to v-strings/qr as it is only producible when running under
Test::Harness/Test::More.