Log levels

[slifty]

Task

Description

Two things I'd like to revisit around our log levels.

1. Do we want FATAL. Every other log level is supported by node's console except FATAL. Maybe we should remove it? Would make default loggers potentially simpler.

2. Should our constants be UPPERCASE -- we have them as lowercase because... winston? But I'm not sure that is an appropriate reason to have those constants be different from all of our other constants (and frankly, constants as UPPERCASE feels like it is kind of a standard signal).

Relevant Resources / Research

None

Related Issues

None.

[chriszs]

The distinction between a fatal error and an error doesn't seem particularly useful in a logger. One way to signal fatality is throw an exception.

[slifty]

We should probably have a NOTHING level as well (since these levels are used to specify the level of logging, not just used to define log methods)