Improve correspondance between scales and bubbles (but still need better improvement)
Now draw info when mouse over bubble
Minors update and graphics improvements
Now Bubbles names are always on top, the higlighted one is on top of all
A selected bubbles is no longer "highlighted" (no more circle around, for better visibility)
Fix year bug incrementing
Fix highlightedBubble not printed over al bubbles anymore
Add a code comments
Clean code in Core.js
Minor fix
Adjust speed calculation to be slower
Begin of loading window
Now use real value of size and color

Fix minors bugs related to historic due to the new functionnalities
Add title image