Fixed #18. Make CWE and WASC reference in the output.
Fixed #19 exposed attack info. Fixed #20 set cwe, wasc id to None if "0".
Fixed #22. Add site to context so active scan can be used.

Without adding to a context, active scan will not be triggered successfully.
Merge pull request #21 from yeukhon/master

Expose CWE, WASC ids. Expose attack info. Fixed active scan to start.