* Fix logging for dev and test environments
We had some unused code for Timber in our config files for development and test.
However, this was completely clobbering Rails' default behavior of logging out to log/development.log and log/test.log. We should allow for logging in these environments in particular, and since we're not using Timber there, we can just revert to using the Rails default debugging log levels.
* Add Timber logger to specs that explicitly require it
* Restore default Rails.logger in specs using Timber logger
* Explicitly use Rails.logger in OmniauthCallbacksController
We seem to have different logger classes leaking into this controller in tests.
I'm not entirely sure why this is/haven't been able to investigate yet, but I do think we should be using the Rails.logger explicitly until we can figure that out.
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