Add support for PHP 5.6
Issue #65: Add again Propel from sfDatabaseSessionStorage

Rollback droping support for Propel sessions in database
Merge pull request #66 from mmonguilod/master

Fix #65: Add again Propel from sfDatabaseSessionStorage
Update changelog
Merge pull request #62 from LExpress/php-5.6

Add support for PHP 5.6
Prepare 1.5.3
Bump to 1.5.4-DEV
Merge remote-tracking branch 'upstream/master'