Adding the necessary files so that Guard can be its own installable component

src/Symfony/Component/Security/Guard/.gitignore

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+vendor/
+composer.lock
+phpunit.xml

src/Symfony/Component/Security/Guard/LICENSE

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+Copyright (c) 2004-2015 Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

src/Symfony/Component/Security/Guard/README.md

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+Security Component - Guard
+==========================
+
+The Guard component brings many layers of authentication together, making
+it much easier to create complex authentication systems where you have
+total control.
+
+Resources
+---------
+
+Documentation:
+
+https://symfony.com/doc/2.8/book/security.html
+
+Tests
+-----
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/Security/Guard/
+    $ composer.phar install --dev
+    $ phpunit

src/Symfony/Component/Security/Guard/composer.json

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+{
+    "name": "symfony/security-guard",
+    "type": "library",
+    "description": "Symfony Security Component - Guard",
+    "keywords": [],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Fabien Potencier",
+            "email": "fabien@symfony.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=5.3.9",
+        "symfony/security-core": "~2.8|~3.0.0",
+        "symfony/security-http": "~2.8|~3.0.0"
+    },
+    "require-dev": {
+        "symfony/phpunit-bridge": "~2.8|~3.0.0",
+        "psr/log": "~1.0"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Component\\Security\\Guard\\": "" }
+    },
+    "minimum-stability": "dev",
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.8-dev"
+        }
+    }
+}

src/Symfony/Component/Security/Guard/phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false"
+         bootstrap="vendor/autoload.php"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Symfony Security Component Guard Suite">
+            <directory>./Tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./</directory>
+            <exclude>
+                <directory>./vendor</directory>
+                <directory>./Tests</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>