Allowed starting with perl 2.0, though I don't know any better way to impliment this. Also made it check to see if the config file exists instead of dying with a runtime error.

In case you couldn't figure it out, I don't know perl, I just needed
this to run on perl 2.0 and also noticed it throwing runtime errors.
Merge pull request #23 from nilesr/master

permit ruby 2.0 and check for config file on start

The original committer says "perl" but obviously we don't use Perl. Ignore that.