Update composer dependencies

Author: Jamie Snape

composer.json

@@ -15,7 +15,7 @@
         "ext-gd": "*",
         "ext-json": "*",
         "francodacosta/phmagick": "0.4.*@dev",
-        "intervention/image": "~2.0.13",
+        "intervention/image": "~2.0.16",
         "ircmaxell/random-lib": "1.0.*@dev",
         "leafo/scssphp": "~0.1.1",
         "maennchen/zipstream-php": "~0.2.2",
@@ -34,10 +34,10 @@
         "phpunit/dbunit": "1.3.*@dev",
         "phpunit/php-code-coverage": "~2.0.13",
         "phpunit/phpcov": "~2.0.1",
-        "phpunit/phpunit": "~4.3.5",
+        "phpunit/phpunit": "~4.4.0",
         "satooshi/php-coveralls": "~0.6.1",
         "sensiolabs/security-checker": "~2.0.0",
-        "symfony/console": "~2.5.8"
+        "symfony/console": "~2.6.1"
     },
     "suggest": {
         "ext-fileinfo": "*",