A graph database backed implementation for StateFlowGraph

Hi 
I was wondering if you could consider the class [<b>ScalableSFG.java </b>](https://github.com/alirezazarei/crawljax/blob/c790d8f3b35083be40558a4aa470ddd1fdc46c47/core/src/main/java/com/crawljax/core/state/ScalableSFG.java) and kindly provide me with your feedback. Thanks in advance.