Bubble map bubble size. Closes #1068
Bubble map bubble size. Closes #1068

jdk137/vizabi,buchslava/vizabi,Gapminder/vizabi,Gapminder/vizabi,dab2000/vizabi,buchslava/vizabi,dab2000/vizabi,jdk137/vizabi,sergey-filipenko/vizabi,vizabi/vizabi,Gapminder/vizabi,jdk137/vizabi,sergey-filipenko/vizabi,vizabi/vizabi,sergey-filipenko/vizabi,dab2000/vizabi,buchslava/vizabi