Define the "Classes" for create new istances of Kepler objects.
For now these are based on the popular John Resig Class.js.
Usually in some kepler plugins these can be extended adding behaviors/methods using files having the same name combined with the name of plugin extends it. (example Place_pois.js)
define logic and manage data of the places shown on the map and UI
define logic and manage data of the users shown on the map and UI