Natlas-libnmap

- fix issue14: better scripts parsing
- API change for NmapService.scripts_results:
NmapService.scripts_results is now a property
NmapService.scripts_results return an array of scripts results

- fix issue9 address field not correcly parsed:
MAC Address would erase an ipv4 address type.
- added new properties in hosts object API:
NmapHost.ipv4, NmapHost.ipv6, NmapHost.mac
- NmapHost.address property returns the IPv4 or IPv6 or MAC
in that preference order. Use specific calls for determinists
results
- fix API issue10: os_ports_used

There is no guarantee that "finished" or "runstats" will be
received by event parser of process.py.
Summary functions are now flagged as deprecated. To use data
from scan summary of numbers of hosts up, the user of the
lib will have to use NmapParser.parse() and the appropriate
accessors.

Infinite loop while launching several nmap scans in background

Added stop() to terminate nmap scan running in background

separate file

- added NmapOSFingerprint class to provide better API to
fingerprint data
- added unit tests for basic NmapHost API check
- added unit test for basic NmapOSFingerprint class