Add Chamber Security Verification Check

[Chamber](https://github.com/thekompanee/chamber) is our gem for intelligently handling configuration in our Ruby/Rails apps.

Chamber has a really neat feature whereby it creates a public/private keypair for each project.  It uses this keypair to transparently encrypt/decrypt secure settings.

The problem is that you have to remember to run the `chamber secure` command before committing so that you don't accidentally commit unencrypted secure settings.  Not any more!