minor #774 Test against stable versions of leafo/scssphp (stof)

This PR was merged into the 1.4-dev branch.

Discussion
----------

Test against stable versions of leafo/scssphp

This removes leafo/scssphp-compass from the dev requirements as this package seems unmaintained (not updated since 2012), has no stable releases, and does not allow using stable versions of leafo/scssphp (which is necessary on PHP 5.3 as the dev version requires 5.4+).

It also avoids using unbound constraints for other dev dependencies

Commits
-------

0cc2245 Test against stable versions of leafo/scssphp

composer.json

@@ -24,14 +24,13 @@
         "symfony/phpunit-bridge": "~2.7|~3.0",
         "twig/twig": "~1.8|~2.0",
         "leafo/lessphp": "^0.3.7",
-        "leafo/scssphp": "*@dev",
-        "ptachoire/cssembed": "*",
-        "leafo/scssphp-compass": "*@dev",
+        "leafo/scssphp": "~0.1",
+        "ptachoire/cssembed": "~1.0",
 
-        "cssmin/cssmin": "*",
-        "mrclay/minify": "*",
-        "kamicane/packager": "*",
-        "joliclic/javascript-packer": "*",
+        "cssmin/cssmin": "3.0.1",
+        "mrclay/minify": "~2.2",
+        "kamicane/packager": "1.0",
+        "joliclic/javascript-packer": "1.1",
         "patchwork/jsqueeze": "~1.0|~2.0",
         "psr/log": "~1.0"
     },

tests/Assetic/Test/Filter/ScssphpFilterTest.php

@@ -23,8 +23,8 @@ class ScssphpFilterTest extends \PHPUnit_Framework_TestCase
 {
     protected function setUp()
     {
-        if (!class_exists('scssc')) {
-            $this->markTestSkipped('scssphp is not installed');
+        if (!class_exists('Leafo\ScssPhp\Compiler')) {
+            $this->markTestSkipped('leafo/scssphp is not installed');
         }
     }
 
@@ -65,6 +65,10 @@ public function testImport()
 
     public function testCompassExtensionCanBeEnabled()
     {
+        if (!class_exists('scss_compass')) {
+            $this->markTestSkipped('leafo/scssphp-compass is not installed');
+        }
+
         $expected = <<<EOF
 .shadow {
   -webkit-box-shadow: 10px 10px 8px red;