function dropWhile(array, predicate, thisArg) {
	      var length = array ? array.length : 0;
	      if (!length) {
	        return [];
	      }
	      var index = -1;
	      predicate = getCallback(predicate, thisArg, 3);
	      while (++index < length && predicate(array[index], index, array)) {}
	      return baseSlice(array, index);
	    }
Creates a slice of `array` excluding elements dropped from the beginning.
Elements are dropped until `predicate` returns falsey. The predicate is
bound to `thisArg` and invoked with three arguments; (value, index, array).

If a property name is provided for `predicate` the created "_.property"
style callback returns the property value of the given element.

If an object is provided for `predicate` the created "_.matches" style
callback returns `true` for elements that have the properties of the given
object, else `false`.

@static
@memberOf _
@type Function
@category Array
@param {Array} array The array to query.
@param {Function|Object|string} [predicate=_.identity] The function invoked
 per element.
@param {*} [thisArg] The `this` binding of `predicate`.
@returns {Array} Returns the slice of `array`.
@example

_.dropWhile([1, 2, 3], function(n) { return n < 3; });
// => [3]

var users = [
  { 'user': 'barney',  'status': 'busy', 'active': true },
  { 'user': 'fred',    'status': 'busy', 'active': false },
  { 'user': 'pebbles', 'status': 'away', 'active': true }
];

// using the "_.property" callback shorthand
_.pluck(_.dropWhile(users, 'active'), 'user');
// => ['fred', 'pebbles']

// using the "_.matches" callback shorthand
_.pluck(_.dropWhile(users, { 'status': 'busy' }), 'user');
// => ['pebbles']