More examples for the code

Hi abojchevski,

I've already run your example, it worked perfectly and reproduced results in your paper.

However, I wonder how to run the other models, like $A_{DW_2}$, which seems works better than $A_{DW_3}$ in your paper.

Besides, I also want to know how to conduct a targeted attack by your codes, and with setting like adding edges instead of removing.

Thanks in advance.

In utils.py, there is a function generate_candidates_addition, you may use to generate additions.