client: file and environment variables based configuration#4144

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mitake wants to merge 3 commits intoetcd-io:masterfrom mitake:client-config

+41,458-4

Commits on Jan 28, 2016

client: file and environment variables based configuration
mitake
committed
contrib: an example of client configuration based on file or environment variables
mitake
committed
Godeps: import viper for client library configuration
mitake
committed