Cleanup for production use
Cleanup for production use

* Do not touch storage and cookies (removed log level persistence).
* Provide `log` method at the INFO level to make a complete drop-in
`console` replacement.
* Throw error objects, not strings.
* Return `false` instead of a message-like string.
* Format the levels object one key per line.
* Use license comment format.
* Use "use strict"; and jshint hints.

sompylasar/loglevel