add NEWS block for 5.6.0RC2
Merge branch 'PHP-5.6'

* PHP-5.6:
  add NEWS block for 5.6.0RC2
add missing entry to NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  add missing entry to NEWS
add missing entry to NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  add missing entry to NEWS