Add rake quality check

Generates the following rake tasks.

```
rake quality:check                      # Run all tasks to check quality
rake quality:check:brakeman             # Run brakeman
rake quality:check:mago                 # Run mago
rake quality:check:metric_fu            # Run metric_fu
rake quality:check:rubocop              # Run rubocop
rake quality:check:sandi_meter          # Run sandi_meter
```

Moved from https://github.com/Helabs/jumpup/pull/15