Merge branch 'PHP-5.5' of git.php.net:php-src into PHP-5.5

* 'PHP-5.5' of git.php.net:php-src: (107 commits)
  Typo fix: umknown -> unknown
  add news entry about FPM backlog change
  Fix bug #66008
  updated libs_versions.txt
  Update NEWS
  Update NEWS
  Fixed Bug 64760 var_export() does not use full precision for floating-point numbers
  add bundled libzip LICENSE, as required by BSD License terms
  - Updated to version 2013.8 (2013h)
  Use zval* instead of zval**
  Increased limit for opcache.max_accelerated_files to 1,000,000. (Chris)
  Improved performance of array_merge() by eliminating useless copying
  Improved performance of func_get_args() by eliminating useless copying
  Link to more readmes
  increase backlog to the highest value everywhere
  Update NEWS
  Fixed bug #65950 Field name truncation if the field name is bigger than 32 characters
  - Updated to version 2013.7 (2013g)
  Increment version number, since this will be 5.5.6.
  Added Zend Debugger to the note about the load order (by trash4you at online dot de)
  ...