reworked NEWS for 5.6.0GA
Improved performance of json_encode()
fixed DBG_INF macro name
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  fixed DBG_INF macro name
Merge branch 'PHP-5.6'

* PHP-5.6:
  fixed DBG_INF macro name
  reworked NEWS for 5.6.0GA