Corrections effectuées par php-cs-fixer

src/Model/Node/Member/MethodInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Model/Node/Trait_.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Model/NodeInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Model/ToConfigInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Model/TypedSymbol.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Utils/Singleton.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/AbstractWriter.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/OutputWriter.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/StreamWriter.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/WritableArrowInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/WritableInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/WritableNodeInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.

src/Writer/WriterInterface.php

-<?php
+<?php declare(strict_types=1);
 /*
  * Copyright (C) 2016-2017 IRSTEA
  * All rights reserved.