Added Object.get()

On an object, gets the requested property or returns a default value.

Eg:
_.get({ 'a': 1, 'b': 2, 'c': 3 }, 'b', 42);
// => 2
_.get({ 'a': 1, 'b': 2, 'c': 3 }, 'd', 42);
// => 42

PS: I couldn't find out how to generate the dist directory