Closes #34 for logging to file
Implements RSA keysize reporting via the certreport pipe

Also fixes `error_seconds` and `warning_seconds` option names to match the documentation.
Merge pull request #36 from peter-/logfile_issue_34

Closes #34 for logging to file - very nicely done
Merge pull request #37 from peter-/keysize_certreport

Implements RSA keysize reporting via the certreport pipe
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