function tap(value, interceptor, thisArg) {
	      interceptor.call(thisArg, value);
	      return value;
	    }
This method invokes `interceptor` and returns `value`. The interceptor is
bound to `thisArg` and invoked with one argument; (value). The purpose of
this method is to "tap into" a method chain in order to perform operations
on intermediate results within the chain.

@static
@memberOf _
@category Chain
@param {*} value The value to provide to `interceptor`.
@param {Function} interceptor The function to invoke.
@param {*} [thisArg] The `this` binding of `interceptor`.
@returns {*} Returns `value`.
@example

_([1, 2, 3])
 .tap(function(array) {
   array.pop();
 })
 .reverse()
 .value();
// => [2, 1]