update to denominator 1.1.4 which include config file support

Thanks to @digitalsanctum for authoring config file support, especially handy when working with different cloud accounts.

Here's an example of a configuration file:
```
name: route53-test
provider: route53
credentials:
  accessKey: foo1
  secretKey: foo2
---
name: ultradns-prod
provider: ultradns
credentials:
  username: your_username
  password: your_password
Then use the -C arg to define the path to the configuration file and the -n arg to select the named provider.
```

For example, `denominator -C /path/to/config.yml -n route53-test zone` works as expected.