Ensure $sources is Array before use
Merge pull request #1069 from radig/master

Ensure $sources is Array ( fix #3520 )
Add OK or Successful HTTP codes 200-206 to HttpResponse::isOK(). Fixes #3531
Merge pull request #1072 from uzyn/httpresponse-3531

Add OK or Successful HTTP codes 200-206 to HttpResponse::isOK().

Fixes #3531
Merge branch 'master' into 2.3

Conflicts:
	lib/Cake/Network/Http/HttpResponse.php