removed csscrush as it was causing timeouts for some cases

composer.json

@@ -11,12 +11,11 @@
   ],
   "require": {
     "matthiasmullie/minify": "^1.3",
-    "doctrine/cache": "1.*",
-    "leafo/scssphp": "*",
+    "doctrine/cache": "^1.6",
+    "leafo/scssphp": "^0.6",
     "tedivm/jshrink": "^1.1",
     "twig/twig": "^1.23",
-    "oyejorge/less.php": "v1.7.0.10",
-    "css-crush/css-crush": "*"
+    "oyejorge/less.php": "v1.7.0.10"
   },
   "require-dev": {
     "phpunit/phpunit": "*"

src/Response.php

@@ -3,6 +3,7 @@
 Namespace Crecket\DependencyManager;
 
 use JShrink\Minifier;
+use MatthiasMullie\Minify\CSS;
 
 final class Response
 {
@@ -219,10 +220,15 @@ public function getCollection()
         }
 
         // if result is css, run the file through a auto prefixer
-        if (isset($this->response_type['css'])) {
-            $contents = csscrush_string($contents, array(
-                'minify' => $this->minify
-            ));
+        if (isset($this->response_type['css']) && $this->minify) {
+            //create new minifier
+            $minifier = new CSS();
+
+            // add contents to the minfier
+            $minifier->add($contents);
+
+            // get results
+            $contents = $minifier->minify();
         } else if (isset($this->response_type['js'])) {
             if ($this->minify) {
                 // minify js