Add the ability to give the full qualified path

this allow the caller to define wich nmap binary to use
in case :
- nmap is not in the path
- more than one nmap on the system
comment all but one mongo version

This will reduce our footprint on travis by reducing testing build
testing again so many version of mongo is useless
move sample to process-stressbox
move sample to process-stressbox... again!
Merge pull request #32 from bmx0r/master

Add the ability to give the full qualified path