fixed: added support for os fingerprint, ipseq, tcpseq, uptime. fixme: NmapHost strtime constr.
fixed: NmapHost factory: missing starttime and endtime
added support for nse scripts in parser. fixme: add support in report
fixed bug, wrong var name referenced
replaced NmapHost.scanned_hosts by NmapHost.hosts
Massive changes in libnmap.objects API:

- added support for scripts in NmapService
- added support for extra hosts data in NmapHost
- added support for OS fingerprint data in NmapHost

TODO:
    - check keys before returning values
    - try/except management
    - review unittests
    - sleep()