Merge branch 'PHP-5.6'

* PHP-5.6:
  add missing entry to NEWS
unused variables
Fixed MySQLi built with mysqlnd
Fixed various bugs
Fixed segfault
Fixed invalid read
Fixed reference handling of bind_result
Fixed stat fields name
Fixed releasing of hash_key
Fixed hash key in persistent hash
Fixed paramters binding
Fixed mysqli_get_links_stats
Refcount may have different meaning in PHP NG
Fixed pdo_mysql build with mysqlnd
Fixed PDO_PARAM_ZVAL
skip this test which fails without network
Merge branch 'PHP-5.6'

* PHP-5.6:
  skip this test which fails without network
Fixed bugs in binding result
Fixed memory leak
Fixed compilation