Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/sebastian/comparator/README.md

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+[![Build Status](https://travis-ci.org/sebastianbergmann/comparator.svg?branch=master)](https://travis-ci.org/sebastianbergmann/comparator)
+
+# Comparator
+
+This component provides the functionality to compare PHP values for equality.
+
+## Installation
+
+To add Comparator as a local, per-project dependency to your project, simply add a dependency on `sebastian/comparator` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on Comparator 1.2:
+
+```JSON
+{
+    "require": {
+        "sebastian/comparator": "~1.2"
+    }
+}
+```
+
+## Usage
+
+```php
+<?php
+use SebastianBergmann\Comparator\Factory;
+use SebastianBergmann\Comparator\ComparisonFailure;
+
+$date1 = new DateTime('2013-03-29 04:13:35', new DateTimeZone('America/New_York'));
+$date2 = new DateTime('2013-03-29 03:13:35', new DateTimeZone('America/Chicago'));
+
+$factory = new Factory;
+$comparator = $factory->getComparatorFor($date1, $date2);
+
+try {
+    $comparator->assertEquals($date1, $date2);
+    print "Dates match";
+}
+
+catch (ComparisonFailure $failure) {
+    print "Dates don't match";
+}
+```
+