Fix --help in nqp.
Fix nqp::setinvokespec on parrot. Add a test for it.
fixed nqp::objprimspec
Factor out the serialization into a seperate method for easier overriding.
Merge remote-tracking branch 'origin/fix-help'
Merge remote-tracking branch 'origin/fix-set-invocation-spec'
Test that when calling methods we can use |@args and |%args.