added zendframework/zendxml into require at Zend\Json's composer.json
move zendxml to suggest and mark to Json::fromXml() as @deprecated
update comment on suggest
See facebook/hhvm#1221
See facebook/hhvm#2018
See https://github.com/facebook/hhvm/blob/HHVM-3.3.1/hphp/doc/inconsistencies

Conflicts:
	tests/ZendTest/Http/ClientTest.php
fixing http query parameters

Zend\Stdlib\Parameters is not converted to PHP array in HHVM
Merge branch 'hotfix/#6231-fix-http-query-parameters-to-array-cast-on-hhvm'

Close #6231
Memcached returns FALSE on failure
... so it's not required to check for NULL, too.
The note Memcached returns NULL was a miss information in changelog of memcached-2.0
PHP-CS-Fixer: restrict level to specified fixers
CS Fix
#6872 - reverting automated CS fix that introduced broken newline
#6872 - reverting automated CS fix that moved a comment after a brace
#6872 - reverting `if` block brace start, for readability
#6872 - reverting alignment: was overflowing 120 chars
Merge branch 'cs/#6872-php-cs-fixer-automated-fixes'

Close #6872
String access via brackets instead of braces
Replace Nested Conditional with Guard Clauses
Merge branch 'cs/#6873-cs-braces-string-access-and-class-declaration-psr2-compliance'

Close #6873
Fixed #6818
added PR id to @deprecated
/see/by