Examples for _.object.builders.js

I've added a few examples showing how to use the functions in that module.

I was trying to come up with a proper section about the difference between `_.clone` and `_.snapshot`, but I honestly could not, do you have any hints?

Also, I've got a question about the code, should I send an email to the maintainer or is it fine if I open an issue here?

I'm of course open to suggestions about the style / grammar / usefulness / etc

Cheers