This commit finally introduces a fully working twitter plugin, right now it uses Google Map API for GeoCoding (Street address to Lat-Lon) but I am working on using OSM API's to do that. :)

On side note, the Twitter API are undergoing major changes so I don't know this would change or not, and I am not using any cache to store already geodecoded names, so I may hit limit on my API key, so I am planning to change that in near future.