Fixed CS using PHP-CS-Fixer

Using [PHP-CS-Fixer](http://cs.sensiolabs.org/) to fix the coding standards according to Symfony style.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT

Result:

```
 1) Command/GenerateDoctrineCommand.php (braces)
 2) Command/GenerateDoctrineCrudCommand.php (empty_return, multiline_array_trailing_comma, ternary_spaces, braces)
 3) Command/GenerateDoctrineDocumentCommand.php (multiline_array_trailing_comma, braces)
 4) Command/GenerateDoctrineFormCommand.php (braces)
 5) Command/Validators.php (braces)
 6) Generator/DoctrineCrudGenerator.php (function_declaration, braces)
 7) Generator/DoctrineDocumentGenerator.php (multiline_array_trailing_comma, braces)
 8) Generator/DoctrineFormGenerator.php (braces)
 9) Generator/Generator.php (remove_leading_slash_use, braces)
10) Tests/autoload.php (function_declaration)
11) Tests/Command/GenerateDoctrineCrudCommandTest.php (multiline_array_trailing_comma)
12) Tests/Command/GenerateDoctrineDocumentCommandTest.php (multiline_array_trailing_comma)
13) Tests/Generator/DoctrineCrudGeneratorTest.php (braces)
14) Tests/Generator/DoctrineFormGeneratorTest.php (braces)
15) Tests/Generator/GeneratorTestCase.php (multiline_array_trailing_comma, braces)
```