golang-github-spf13-viper-dev 0.0~git20151224.0.110492b-1 (amd64 binary) in ubuntu xenial

 Viper is a complete configuration solution for go applications.
 It is designed to work within an application, and can handle
 all types of configuration needs and formats. It supports:
 .
  * setting defaults
  * reading from JSON, TOML, and YAML config files
  * reading from environment variables
  * reading from remote config systems (etcd or Consul), and watching changes
  * reading from command line flags
  * reading from buffer
  * setting explicit values
 .
 Viper can be thought of as a registry for all of your applications
 configuration needs.