function wrapperChain() {
	      return chain(this);
	    }
Enables explicit method chaining on the wrapper object.

@name chain
@memberOf _
@category Chain
@returns {Object} Returns the new `lodash` wrapper instance.
@example

var users = [
  { 'user': 'barney', 'age': 36 },
  { 'user': 'fred',   'age': 40 }
];

// without explicit chaining
_(users).first();
// => { 'user': 'barney', 'age': 36 }

// with explicit chaining
_(users).chain()
  .first()
  .pick('user')
  .value();
// => { 'user': 'barney' }