Easily add non intrusive attribution control : replace the maybe long copyright text by a little button with a popup
###How to use it
1 - Import src/super-attribution.js to your project 2 - Then use the following code :
var map = L.map('map',{ attributionControl : false, superAttributionControl : true });
map.attributionControl.addAttribution('<a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors')