Support mangle option for uglify

[rschooley]

Uglify.js supports mangle: false as an option. With the default value of true Angular.js dependencies are broken during minification.

[Agamennon]

First (thank you!) nap is cool, but uglify mangle does not play well with a lot of libraries, please include the option to pass instead of a boolean to minify the ability to pass a object like minify: {mangle:false}

[craigspaeth]

I've added the uglifyOpts option which should now let you pass { mangle: false }. Let me know if I missed anything.

Cheers!