fix(logger): Improve logger names

[krancour]

loggo loggers exist in a hierarchy and the dotted names denote where a logger exists within that hierarchy. Ordinarily, the "root logger" ("") is used for a main package and all other loggers' names reflect their location relative to that. Contextually, this information can be important when attempting to identify the source of a log message.

Since this framework doesn't contain a main package, but is used by executable programs that do (e.g. steward-cf), I feel things are kept a bit more tidy, and logs kept more accurate and informative if the logger names used throughout this project are all relative to framework and not "".

[codecov-io]

Current coverage is 51.56% (diff: 100%)

Merging #50 into master will not change coverage

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