Started working on clustering display...

...took me some time to realize how to use this API, but hope I made some progress :)
For the moment I have:  function to display a circle,
                        function to go through clusters and display all the circles in it
TODO:   Need to find how to get pixel from geoloc, need to do the level thing
Merge branch 'master' of https://github.com/TweetAggregator/TweetAggregator