Remove unnecessary doc file.
Show errors, and don't include them in timing stats
Merge pull request #21 from pasc/valid_only_count

Show errors, and don't include them in timing stats
Merge branch 'master' of github.com:rakyll/boom
Making sure no histogram and latency summary is printed if all reqs fail. Minor formatting change for error reporting.
Merge branch 'master' of https://github.com/rakyll/boom
Merge upstream