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Changes in version 0.17

- Added the ability to automatically generate rules to check the source
  addresses of traffic based on the routing table with the
  'add_route_rules' command.
- Fixed a bug with inserting rules at the start of a list.
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Changes in version 0.16

- Added support for port ranges in the "rule" command, by means of
  setting srcport or dstport to a tuple containing two port numbers.
- Fixed up negative port number handling to indicate a "not-matching"
  condition.
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Changes in version 0.15

- Force the standard three chains (input, forward, output) to be scanned
  last, to try to avoid creating references to nonexistant chains.
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Changes in version 0.14

- Fixed bug in interpreting diff line numbers when multiple sections are
  output.
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Changes in version 0.13

- Added a proper init script.
- Double check the target type when redirecting.
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