Copy backend configurations into resource backends #95
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Previously, resource backends received a copy of the default backends, which contains a BackendConfigs, which in turns contains /pointers/ to specific backend configurations (e.g. *backends.EtcdConfig). As a result, resource backends eventually pointed to the default backend configurations.
Now, resource backends receive the result of a Backends.Copy() function, which explicitly copies specific backend configurations from the default backends.
Closes #94