Add ability to scan elb and filter unused security groups that are attached to elb

[rohanagrawal-amex]

Add ability to scan elb and filter unused security groups that are attached to elb

[rohanagrawal-amex]

I will submit the PR soon for this

[fleaz]

What do you mean by "unused security groups that are attached to elb"?

[rohanagrawal-amex]

hi @fleaz - sorry i should have been more descriptive on the issue. What i meant is since currently the code doesn't scan for elb so any security groups those are tied to elbs and not used by any other aws resources are also being flagged for being unused. I have added this PR: #18 that will add the elb scan feature as well as remove any security groups from unused sg in case an elb was using that.