- review OS fingerprint API and add NmapOSFP class

- add unit test for os fingerprint class

- complete unit tests with coverall support

- review and improve threading for NmapProcess

- support for python3

- support for windows

- Add new plugins to support import/export from mysql, couchdb, csv

- add unittest for udp scans, ping sweeping

- add support for 'resume' capability (see nmap --resume)

- add support for "not shown ports" (extra ports) in NmapHost (via NmapParser)