Using hrefs in title

[polymorphicengine]

Hey, there is a problem when using hrefs in the title of a node and wanting to add a title to an edge. i looked at the code and what's happening is basically that

.vis-network-tooltip {
display:none;
}

just hides everything. but i guess if you change it then there will be two titles on the nodes.. would be nice if you could fix it

all the best

[BerserkerGaruk]

Duplicates #54