Upgrade Symfony components to v2.6.x
Fix Symfony/Yaml::parse warning
Merge pull request #401 from ushahidi/upgrade-symfony-components

Upgrade Symfony components, refs #399
hasColumn and getColumns allow reserved keywords in tableName (+ tests)
Merge pull request #403 from trilopin/0.4.x-dev

Update hasColumn and getColumns to allow using reserved keywords
Merge commit '09879087629b318aaf26882c4532d1ae8e9b4a06' into 0.4.x-dev