Add support for version flag to audittool

[TBRC-Travis]

How do you know which version of audittool you're running? Right now on Linux you have to run the following to know which version you're running: update-alternatives --display audittool.sh

On Macs it's not all that clear how to determine the version you're running.

For the next release of audittool it would be great to add a --version flag to make it easy to determine the version you're running.

[jimk-bdrc]

Not only display, but capture version info in log output

[jimk-bdrc]

https://itaffinity.wordpress.com/2014/02/25/maven-create-a-simple-build-number/

[jimk-bdrc]

Closed in PR #153