mixin
Util
since 0.1.0
Returns
Function|Object `object`.
Adds all own enumerable string keyed function properties of a source
object to the destination object. If object is a function, then methods
are added to its prototype as well.
Note: Use _.runInContext to create a pristine lodash function to
avoid conflicts caused by modifying the original.
Example of Lodash _.mixin
function vowels(string) {
  return _.filter(string, function(v) {
    return /[aeiou]/i.test(v);
  });
}
_.mixin({ 'vowels': vowels });
_.vowels('fred');
// => ['e']
_('fred').vowels().value();
// => ['e']
_.mixin({ 'vowels': vowels }, { 'chain': false });
_('fred').vowels();
// => ['e']