fix BC
add single delegator tests for abtract plugin manager
add multiple delegator test for abtract plugin manager
test cleanup
add delegator factory validation testing
add delegator from callback test
fix callback test
add callback support for delegator factories
code cleaning
Update DateFormat.php

In versions of PHP >= 5.5.0, the method IntlDateFormatter::setTimeZoneId() and IntlDateFormatter::setTimeZone() should be used instead.

This is my first proposed zf fix, so hopefully the ternary + dynamic method name var is acceptable.
Fixes and remove duplicates
Fix getContents from FunctionReflection & other fix examples documentation
Fix getContents in MethodReflection, fix reflection getBody/getContent for empty function/method
Add closure getContent coverage
 Abstract cannot define the implementation
Merge branch 'hotfix/php-cs-fixer' of github.com:Maks3w/zf2 into Maks3w-hotfix/php-cs-fixer
Close #5281
Forward port #5281
Merge branch 'hotfix/psr-2-function_declaration' of github.com:Maks3w/zf2 into Maks3w-hotfix/psr-2-function_declaration
Close #5282