v0.4

• Add support for modd, with the -m flag.
• Add -X flag to set Access-Control-Allow-Origin: * on all responses, allowing
  the use of multiple .devd.io domains in testing.
• Add -L flag, which turns on livereload but doesn't trigger on modification,
  allowing livereload to be driven by external tools.
• Add -C flag to force colour output, even if we're not attachd to a terminal.
• Add -t flag to disable timestamps.
• Silence console errors due to a stupid long-standing Firefox bug.
• Fix throttling of data upload.
• Improve display of content sizes.
• Add distributions for OpenBSD and NetBSD.