Merge branch 'PHP-5.6'
add clear_env option to FPM config

This makes it possible to leave the envoronment as is on startup and
pass all the variables to the workers.
The default value of clear_env is "yes", preserving previous behaviour.
Patch by Paul Annesley.
Merge branch 'pull-request/598'

* pull-request/598:
  add clear_env option to FPM config
Merge branch 'PHP-5.6'

* PHP-5.6:
  fixed macro
  add clear_env option to FPM config
corrections to the zpp readme
zpp readme adjustment
Use API instead of directly acessing the structure
Merge branch 'PHP-5.6'
fixed typo
Merge remote-tracking branch 'origin/PHP-5.6' into str_size_and_int64_56_backport

* origin/PHP-5.6:
  Use API instead of directly acessing the structure

Conflicts:
	ext/mysqli/mysqli_prop.c
Merge remote-tracking branch 'origin/str_size_and_int64_56_backport' into str_size_and_int64

* origin/str_size_and_int64_56_backport:
  fixed typo
  Use API instead of directly acessing the structure
  zpp readme adjustment

Conflicts:
	README.PARAMETER_PARSING_API
Merge remote-tracking branch 'origin/master' into str_size_and_int64

* origin/master:
  add clear_env option to FPM config