stripe / stripe-go / 2970

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Pull #611

travis-ci

Introduce `GetBackendWithConfig` and make logging configurable per backend

Introduces a new system for getting backends with a set of custom
configuration that's a little cleaner than adding a new setter for every
option that we add in the future.

`BackendConfig` is introduced a user configurable struct which is then
passed to `GetBackendWithConfig`, which returns a backend configured to
spec. `GetBackend` remains, is backward compatible, and continues to set
a default backend for either type.

A new option on `BackendConfig` is being able to set a per-backend
`Logger` and `LogLevel`. This is the impetus that sparked this change as
documented in #608.

So the unfortunate part is that `BackendConfig` is confusingly named
similarly to the very poorly named `BackendConfiguration`, which is the
final implementation of a backend. I wanted to keep this patch backward
compatible, but I want to make a breaking change in the future to rename
this to `backendImplementation` and make it unexported at the same time
because it shouldn't be needed outside of the core package.

We should also unexport `NewBackends` at the same time. It was
introduced to allow some configuration for backends, but it was a pretty
bad idea.

Fixes #608.

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