Backward compatibility

Added module.exports = exports['default']; to index.js so that es2015 is not mandatory for calling modules.

First release

console methods log, warn and error can be muted concurrently without interfering.

Fixed index.js and doc

Tested for console logger and its methods log, warn and error for multiple arguments, formatted or not.

Not yet tested when multiple instances are used simultaneously. Still expect conflicts.

First pre-release

Won't work unless you run 'gulp dist' first in the root directory. I pushed this first version too quickly.