Display tweets in a map in real time

[mef]

Client-side, show one point for each geolocated tweets.

• [x] use actual coordinates for tweets geolocated at an exact location
• [x] point randomly inside the provided bounding box for tweets geolocated in a city

First version to start with an empty map, only client side. No removal of older points. To be enhanced later on.

[mef]

heads-up @11digitlabs: I solved the problem of aligned points, you may want to remove your persisted data in order to start with a clean dataset:

• stop server
• rm persist/dHdlZXRz
• then start server