- ANSI coloring output from `bunyan` CLI tool (for the default output mode/style).
Also add the '--color' option to force coloring if the output stream is not
a TTY, e.g. `cat my.log | bunyan --color | less -R`. Use `--no-color` to
disable coloring, e.g. if your terminal doesn't support ANSI codes.
- Add 'level' field to log record before custom fields for that record. This
just means that the raw record JSON will show the 'level' field earlier,
which is a bit nicer for raw reading.