ENYO-2691: Fixed issue about less-1.3.3.min.js not stored in npm pack .tgz result

* ENYO-2691: Updated shrink-wrap.json for new less dependency
* ENYO-2691: Fixed issue about less-1.3.3.min.js not stored in npm pack .tgz result

Tested on Chrome/OSX and Chrome/Win7

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>