Fix format errors in nova security group rule list

* port range was throwing exception for None to/from ports
* ip_range didn't always have cidr causing error
* ip_protocol None at times and looked bad

Closes-Bug #1256935

Change-Id: I451a0f038a3e9646bca3f278c5d6f6d7e3097a83
Update release notes for 0.3.1

* update README
* update man page
* fix doc errors

Change-Id: I5682654bf482289879c8ba9016e348f2b2782971
Merge "Fix format errors in nova security group rule list"
Merge "Update release notes for 0.3.1"