Confusing usage of the GraphBuilder

[pablormier]

The current implementation of the GraphBuilder that exploits type inference is more confusing than useful in different contexts. The current implementation does not allow simple things such as:

builder = GraphBuilder.create();
builder.connect("A").to("B").withEdge(2);
builder.connect("A").to("C").withEdge(3); 
...

Not supporting these kind of typical usages of a builder pattern is clearly a wrong decision.