Merge branch '3.1'

* 3.1:
  [PropertyAccess] Fix for PHP 7.0.7
  [Yaml] search for colons in strings only
  bumped Symfony version to 3.1.0
  updated VERSION for 3.1.0-RC1
  updated CHANGELOG for 3.1.0-RC1
  fixed PHP 5.3 compat in tests

Author: nicolas-grekas

Tests/PropertyAccessorTest.php

@@ -242,7 +242,9 @@ public function testSetValueThrowsNoExceptionIfIndexNotFoundAndIndexExceptionsEn
      */
     public function testSetValueThrowsExceptionIfNotArrayAccess()
     {
-        $this->propertyAccessor->setValue(new \stdClass(), '[index]', 'Updated');
+        $object = new \stdClass();
+
+        $this->propertyAccessor->setValue($object, '[index]', 'Updated');
     }
 
     public function testSetValueUpdatesMagicSet()
@@ -259,7 +261,9 @@ public function testSetValueUpdatesMagicSet()
      */
     public function testSetValueThrowsExceptionIfThereAreMissingParameters()
     {
-        $this->propertyAccessor->setValue(new TestClass('Bernhard'), 'publicAccessorWithMoreRequiredParameters', 'Updated');
+        $object = new TestClass('Bernhard');
+
+        $this->propertyAccessor->setValue($object, 'publicAccessorWithMoreRequiredParameters', 'Updated');
     }
 
     /**
@@ -527,7 +531,9 @@ public function testIsWritableForReferenceChainIssue($object, $path, $value)
      */
     public function testThrowTypeError()
     {
-        $this->propertyAccessor->setValue(new TypeHinted(), 'date', 'This is a string, \DateTime expected.');
+        $object = new TypeHinted();
+
+        $this->propertyAccessor->setValue($object, 'date', 'This is a string, \DateTime expected.');
     }
 
     public function testSetTypeHint()