If you want to feel a bit safer about knowing where your kids are when they leave the house this spring and summer, or you want the ability to keep track of your family and friends,  a number of apps can make it happen. Footprints is an app that allows you to see where your kids are at any given time. The app runs in the background and uses a device’s GPS capabiloties to help parents make sure kids get where they’re supposed to be. You can also set up so-called geofences, such as a playground or school yard, and get an alert if your kid leaves where they’re supposed to…