Fixed wrong link syntax
Added PHP config format
Fixed spacing issues
Added namespaces to examples
Merge pull request #2080 from WouterJ/patch-33

Fixed wrong link syntax
Merge pull request #2083 from WouterJ/add_ref_php_format

Added constraints PHP format and some code tweaks
[#2083] Fixing slight typo thanks to @l3l0
Merge branch '2.0' into 2.1

Conflicts:
	reference/constraints/All.rst
	reference/constraints/Collection.rst
	reference/constraints/Email.rst
Removing some outdated references to MinLength
[#2083] Fixing typo
Merge branch '2.0' into 2.1