added optional arugment to exclude hosts parsed from normal files with empty results from ouput

[jasonmpittman]

Hi,

I made the following changes:

• added the '-e', '--exclude' argument to the argparser object on line 66
• added logic such that a line like "66.110.224.130";"";"";"";"";"";"" will be excluded from output when the '-e' option is issued. this code is spans lines 627 - 636
• updated the version on line 47
• updated the README to reflect the the new argument.

Collectively, these changes cleanup the output when parsing normal nmap files. While this is specific to research I am working on, I thought others might also want to benefit from the change.

-Jason