Pass string as securityrule ethertype; clearer exception message in NVPException.
Fixed pep8 compliance.
Merge pull request #19 from kilogram/master

Corrected NVP SecurityRules data; clearer NVPException messages
Make full use of SecurityRule's kwargs constructor.
Merge pull request #21 from kilogram/master

Minor corrections
Version Bump
Merge branch 'master' of github.com:jkoelker/aiclib