Fixes for xml2rfc 2.4.0

- Added comma after e.g. and i.e.
- Fixed hangText.
Wesley Eddy discuss on minimum timer

- Added "The value MUST be at least 200 milliseconds, which means the
  minimum time delay before dropping a link is 1000 milliseconds."
Merge pull request #178 from petithug/xml2rfc-2.4.0

Fixes for xml2rfc 2.4.0
Merge pull request #180 from petithug/wesley-eddy

Wesley Eddy discuss on minimum timer
update date