Population density awareness nearby

[vpaulino]

This application should give feedback to the user about the population density in the nearby. For this the application should have configuration settings where the person should introduce the number of people that are arround him that should raise a notification telling him about the density of people arround him treshold that is being overcomed. That will allow people to be more caution about the places and the amount of time they spend in some overcrowded place.

[fmaia]

Please consider my comment in #81.