`zombie_scout` assumes some files will always exist

[dgollahon]

Hi,

Thanks for a helpful tool.

When I run zombie_scout I get a large number of warnings like this:

grep: Rakefile: No such file or directory

which I assume is because zombie_scout is directly looking for a Rakefile. My project does not have a Rakefile so this is a bit noisy. I'm not sure if the tool has other, similar assumptions.

The tool seems to work normally though I don't recall seeing it in some previous version.

Thanks, Daniel