Start using Coverity Scan

[jlgreathouse]

In an effort to increase the quality of clARMOR code, we should integrate Coverity Scan into our repo and release process. Since clARMOR is an open source project, we should meet the requirements to use this for free.

At the very least, we should manually use this tool every so often and try to drive our defect count to 0.

Ideally, we would set this up to integrate with Travis-CI. Completing a scan (and fixing any new issues) should gate any release from the development to master branch. This relies on #2.