Copyright header must always stay in place when minifying Javascript, however 
that is not the case making this filter completely useless for anybody using 
3rd party code.

Example:
```
/*! Chosen v1.8.2 | (c) 2011-2017 by Harvest | MIT License, 
https://github.com/harvesthq/chosen/blob/master/LICENSE.md */
  
/**
 * @licence MIT (c) Chosen v1.8.2 | (c) 2011-2017 by Harvest | MIT License, 
https://github.com/harvesthq/chosen/blob/master/LICENSE.md
 */
```

Both of those comments get removed and they should not be. Using @licence or 
/*! to denote copyright headers is very common in the javascript community and 
supported by pretty much any packer out there.

[ Full content available at: 
https://github.com/apache/incubator-pagespeed-mod/issues/1800 ]
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