CouscousPHP#101 Update composer dependencies so that tests pass with …

…the lowest version possible

composer.json

@@ -16,19 +16,20 @@
  ],
  "require": {
  "php": ">=5.4.0",
- "symfony/console": "~2.4",
- "symfony/filesystem": "~2.4",
- "symfony/finder": "~2.4",
- "symfony/process": "~2.4",
- "symfony/yaml": "~2.4",
- "twig/twig": "~1.0",
+ "symfony/console": "~2.6",
+ "symfony/filesystem": "~2.6",
+ "symfony/finder": "~2.6",
+ "symfony/process": "~2.6",
+ "symfony/yaml": "~2.6",
+ "twig/twig": "~1.10",
+ "erusev/parsedown": "~1.5",
  "erusev/parsedown-extra": "~0.7",
  "phine/phar": "~1.0",
- "mnapoli/front-yaml": "~1.4",
+ "mnapoli/front-yaml": "~1.5",
  "php-di/php-di": "~5.0",
  "psr/log": "~1.0"
  },
  "require-dev": {
- "phpunit/phpunit": "~4.3"
+ "phpunit/phpunit": "~4.5"
  }
 }