Eric O'Connell 2540db8adf More flexible subclassing of ApiClient possible by s/private/protected/g (#6159)
* More flexible subclassing of ApiClient possible by s/private/protected/g

I found myself in a situation where I needed to change the configured `Feature`s, but
because of all the private variables I was not able to do so. Perhaps this is a bit too
broad of a stroke, but I changed all fields and methods to `protected` instead of `private`.
In this way, future extensibility should be improved.

Also, to solve my particular problem, I added a new empty method called
`performAdditionalClientConfiguration` which will allow subclasses to add specific features,
or do anything else possible with a `ClientConfig`.

* Updated samples
2017-07-25 14:56:34 +08:00
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