Merge pull request #8 from Swatinem/master

Fixes 7: be quiet by default  (I'll publish as soon as I fix the build)
turn on verbose logging for the self-build with the new --verbose switch.
use log-driver for logging levels.
fix broken test.
added this project's own coverage shield to the README
version bump to 2.0.10
made self-build NOT verbose.
fixed logger bug in the last published version preventing --verbose from working. version bump to 2.0.11.
refactored options parsing out.
removed some stray console.logs remaining.
use a native js yaml parser instead of a C library