Added empty string option for session_cache_limiter as mentionned in the php manual: "Setting the cache limiter to '' will turn off automatic sending of cache headers entirely."
Reverted CS fix
Merge pull request #5605
remove dependency on stdlib package

This commit removes the dependency on the Stdlib package so that the Dom package can be used completely standalone. It does so by extending DOMXpath to wrap each raised error with an ErrorException with logic similar to that used in Stdlib ErrorHandler.
use end() instead of convoluted count()
add back vendor/.gitignore, thanks @samsonasik
Merge pull request #5865 from pmjones/develop

remove dependency on stdlib package
[#5865] Fix filesystem filename case

- s/DOMXpath/DOMXPath/ so that filename and class name match (fixes
  failure in Zend\Dom\Document\Query test)
[#5865] Added note to README.md
Merge branch 'feature/5865' into develop

Close #5865
Merge pull request #5869
[2.3.0] change php require version from 5.3.3 to 5.3.23 in all resources, and remove tests that no longer support 5.3.3
update class_alias condition for PHP_VERSION_ID < 50304
remove 5.3.11 check
update class_alias on Zend/Session/Container.php
update class_alias on SessionArrayStorage
check all version_compare
remove class_aliases for php 5.3 and use implementation instead
fix PHP_VERSION_ID < 50304 check
fix rebase conflict