New OS fingerprint API for libnmap

gistfile1.txt

In [1]: from libnmap.parser import NmapParser
In [2]: p = NmapParser.parse_fromfile('/root/all6.nmap')
In [3]: h = p.hosts.pop()
In [4]: print h.os

Linux 3.7 - 3.9: 98
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
Netgear DG834G WAP or Western Digital WD TV media player: 95
  |__ os class: WAP: Netgear, embedded
    |__ cpe:/h:netgear:dg834g
  |__ os class: media device: Western Digital, embedded
    |__ cpe:/o:westerndigital:wd_tv
Linux 3.8: 95
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
Linux 3.1: 93
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
Linux 3.2: 93
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
AXIS 210A or 211 Network Camera (Linux 2.6): 92
  |__ os class: webcam: AXIS, Linux(2.6.X)
    |__ cpe:/h:axis:210a_network_camera
    |__ cpe:/h:axis:211_network_camera
    |__ cpe:/o:axis:linux_kernel:2.6
Linux 3.7: 92
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
Linux 3.9: 91
  |__ os class: general purpose: Linux, Linux(3.X)
    |__ cpe:/o:linux:linux_kernel:3
Linux 2.4.26 (Slackware 10.0.0): 91
  |__ os class: general purpose: Linux, Linux(2.4.X)
    |__ cpe:/o:linux:linux_kernel:2.4.26
Crestron XPanel control system: 91
  |__ os class: specialized: Crestron, 2-Series
    |__ cpe:/o:crestron:2_seriesFingerprints: