Replace CF_PROMISE_SUMMARY_FILE with filepath in get_last_line_of_file()
Set the value of MAX_SECOND_LATE with --max-seconds
Get rid of the MAX_SECOND_LATE constant and just set the default value of
args.max_seconds to 3600 unless defined on the command line

Pass the value of args.max_seconds to main()

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Merge pull request #1 from skreuzer/master

Allow MAX_SECOND_LATE to be user defined