avoid mixed-content issues in the profiler output

loading the css/js over https in an http page has no negative side-effects
but using http in an https page will cause some browsers to not load the
assets due to mixed-content restrictions
Merge pull request #189 from carbin/brought-to-you-by-the-letter-s

avoid mixed-content issues in the profiler output
remove eof on parrot that breaks on streams

This was meant to unify the behaviour on all backends so that we detect EOF already
before we attempted to read past it. Sadly this does not work out here and we have to
take care about that in rakudo again.
Merge pull request #188 from usev6/master

Fix open command