ALL the Map Features!

#### Features added:
* Pins/Markers with Spiderfier and MarkerClustering
* InfoWindows for pins/markers display song metadata and user can play song from window
* Pulls data from server to populate pins
* Song rankings update from server in conjunction with map filtering drop down menu
* Map checks for new data at an increasing time interval beginning at 20 seconds (only refreshes if there is new data)