Update Makefile to use uglifyjs2.
Update Makefile to use uglifyjs2.

* Takes different options as parameters.

InteractiveIntelligence/Squire,neilj/Squire,natejenkins/squire,yuhange/Squire,natejenkins/squire,xiamidaxia/Squire,ProtonMail/Squire,StileEducation/Squire,InteractiveIntelligence/Squire,xfra35/Squire,yuhange/Squire,gertsonderby/Squire,StileEducation/Squire,ProtonMail/Squire,Endika/Squire,xfra35/Squire,neilj/Squire,lzhengms/Squire,xiamidaxia/Squire,Endika/Squire,nsartor/Squire,gertsonderby/Squire,nsartor/Squire,lzhengms/Squire