Work in progress example of using noop mode

A few people I've spoken with have mentioned the auditing usecase, ie.
knowing when something changes. This example shows using noop mode and a
entertaining shell script to provide a useful auditing tool for security
group changes.
Add full example for auditing usage of AWS module
Add audit example to examples homepage
Correct URL path for audit example
Merge pull request #36 from garethr/audit-security-groups-example

Audit security groups example