fix mongo ref for new constant
fix sockets reference
fix standard: chroot is optionnal
Merge pull request #98 from remicollet/issue-2-20-0

Three references improvement on PHP_CompatInfo 2.20
first snapshot of version 2.21
Version 2.21 will support PHP 5.4.18
Fix GH-97: False positive classMemberAccessOnInstantiation detection
new Release Candidate of PHP 5.4.18 and 5.5.2
update mongo reference to 1.4.3
New stable releases of PHP 5.4 and 5.5 are available
prepare stable release 2.21
update libxml reference for PHP 5.5.2
fixed ereg php max version
stable release 2.21 is available
prepare next incoming stable release 2.22
phar version with --version switch will print the latest version rather than DEV
upgrade latest versions of components used by phar version
upgrade changelog
new stable releases of PHP 5.4 and 5.5
add new function setExcludeVersions() in abstract PHP_CompatInfo_Reference_PluginsAbstract class