Merge pull request #2 from rbsec/master

Code cleanup
Update README.md

update desc
Use argparse instead of sys.argv
Merge pull request #5 from rbsec/argparse

Use argparse instead of sys.argv
Implemented output class
Merge pull request #6 from rbsec/output

Implemented better output
Update dns_dork.py

fixed unicode issue
Update dns_dork.py

fixed unicode
added bing