Pass logger configuration values through to logger initialization

[cdhagmann]

This MR adds three new configuration keys (and their default values) to Sneakers.configuration that are passed through to the logger. These keys are:

• log_rotate_age (Default: 5)
• log_rotate_size (Default: 1048576 [1 MB])
• log_level (Default: 'debug')

A test had to be updated to expect these keys, but I did not see a place to add testing the affect. Willing to push tests where appropriate.

#33

[michaelklishin]

This is a good idea!

[cdhagmann]

Passes the test locally after modify a test that looks at the options hash.

[michaelklishin]

@cdhagmann thank you! How soon or how badly do you need a 3.3.0 release with this change?

[simi]

👍

[cdhagmann]

We are able to pass in a logger instance directly for the moment so we are in no rush.