[CS] Added PHP-CS-Fixer and ruleset

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Added dependency for PHP-CS-Fixer and ruleset based on
https://github.com/doctrine/coding-standard/blob/96b3e19c9a151760e0246687a7143f77c0aff3a0/Docs/README.md

.gitignore

@@ -8,6 +8,7 @@ lib/Doctrine/Common
 lib/Doctrine/DBAL
 /.settings/
 .buildpath
+.php_cs
 .project
 .idea
 vendor/

.php_cs.dist

@@ -0,0 +1,18 @@
+<?php
+
+$finder = Symfony\CS\Finder\DefaultFinder::create()
+    ->in(__DIR__.'/bin/')
+    ->in(__DIR__.'/lib/')
+    ->in(__DIR__.'/tests/')
+    ->in(__DIR__.'/tools/')
+;
+
+return Symfony\CS\Config\Config::create()
+    ->level(Symfony\CS\FixerInterface::PSR2_LEVEL)
+    ->fixers([
+        'align_double_arrow',
+        'align_equals',
+        'concat_with_spaces',
+    ])
+    ->finder($finder)
+;

composer.json

@@ -25,7 +25,8 @@
     },
     "require-dev": {
         "symfony/yaml": "~2.3|~3.0",
-        "phpunit/phpunit": "~4.0"
+        "phpunit/phpunit": "~4.0",
+        "fabpot/php-cs-fixer": "^1.9"
     },
     "suggest": {
         "symfony/yaml": "If you want to use YAML Metadata Mapping Driver"