Merge remote-tracking branch 'cataphract/zpp_improv' into PHP-5.5

See https://wiki.php.net/rfc/zpp_improv

* cataphract/zpp_improv:
  Update README.PARAMETER_PARSING_API
  Export zend_parse_parameter()
  Expose zend_parse_arg() as zend_parse_parameter()
  zend_parse_parameters: allow ! for non pointers

diff --cc Zend/zend_API.c
Simple merge

diff --cc Zend/zend_API.h
Simple merge