Create a new createLogger module for better debugging. Each logger has its own log level and its own createLogger that will nest logs underneath them. `player.log` is also included, which logs the player id as part of the log statement. The history API also got a filter method.
For example:
```js
var log = videojs.log.createLogger('foo');
log('hello');
// > VIDEOJS: foo: hello
```
Add a log levels and history api: `videojs.log.level()` and `videojs.log.history()`.
`.level()` will return the current level and you can also set it to be one of: `all`, `error`, `off`, or `warn`.
`.history()` will return a list of all things logged since videojs loaded. It can be disabled via `videojs.log.history.disable()` (and re-enabled with `enable()`) as well as cleared with `videojs.log.history.clear()`.
