- add image crop support
- clean and enable threshold
- add todo for threshold
- disable threshold for now, will enable it again using CIEDE2000
- (s)rgb distance works way better for now, re enable threshold
- add test for imagecropauto
Merge branch 'PHP-5.5'

* PHP-5.5:
  - add test for imagecropauto
  - (s)rgb distance works way better for now, re enable threshold
  - disable threshold for now, will enable it again using CIEDE2000
  - add todo for threshold
  - clean and enable threshold
  - add image crop support

Conflicts:
	UPGRADING
Merge branch 'master' of git.php.net:php-src
- add noisy php logo for autocrop with threshold test
Merge branch 'PHP-5.5'

* PHP-5.5:
  - add noisy php logo for autocrop with threshold test