Add Tinfoil Security as a tool.

Tinfoil's goal is to empower developers and DevOps with security, making it a regular part of the development / ops process. As you run your unit and integrations tests, you can also run Tinfoil tests as well, making sure the changes you're about to push out are secure.
Adding a Security topic, since there will be other tools that are relevant to DevOps and security.
Merge pull request #60 from borski/master

Add Tinfoil Security as a tool, and add a Security topic.