title: street address to geolocation lat/long
body: <p>I am considering rChart/LeafLet to create a shiny app for housing sales in my county. There are several hundred houses for sale at any given time. Want to map street address-to-geolocation (lat/long) for all and display them on a map.  So, I am looking for a r package, service or database that can map street address to geolocation. </p>