Add colored verification summary

This closes #423 and makes it a lot easier to scan your Travis-CI results. If you use `--mode verify` then you now get output like this: 

![Verification Summary](http://i.imgur.com/N3kg1ZH.png)

Also, this updates the `results.json` format to include full result (pass/warn/fail) of the verification on each test type on each framework. This replaces the binary (e.g. yes or no) warning array that was previously included in the `results.json`