{
  "name": "alxarch/basex-php",
  "require-dev": {
    "sabre/dav": "1.6.4",
    "silex/silex": "dev-master"
  },
  "autoload": {
    "psr-0": {"BaseX": "src/"}
  }
} 

{
  "name": "alxarch/basex-php",
  "require-dev": {
    "sabre/dav": "1.6.4",
    "silex/silex": "dev-master",
    "symfony/security": "2.1.x"
  },
  "autoload": {
    "psr-0": {"BaseX": "src/"}
  }
} 

Add symfony/securtiy as a dev dependency
Add symfony/securtiy as a dev dependency
