Merge branch 'PHP-5.6'

* PHP-5.6:
  fix NEWS order
  update NEWS
  Update the VM generation script, per Bob.
  Update NEWS after rebase.
  Add BEGIN_EXTERN_C() and END_EXTERN_C() to .h files missing them.

diff --cc Zend/zend_float.h
Simple merge

diff --cc Zend/zend_vm_gen.php
Simple merge

diff --cc Zend/zend_vm_opcodes.h
Simple merge