Use PSR-4 and autoload-dev to fix test structure

Author: Jean85

composer.json

@@ -26,10 +26,15 @@
         "phpunit/phpunit": "^4.6.6"
     },
     "autoload": {
-        "psr-0" : {
+        "psr-4" : {
             "Sentry\\SentryBundle\\": "src/Sentry/SentryBundle"
         }
     },
+    "autoload-dev": {
+        "psr-4" : {
+            "Sentry\\SentryBundle\\Test\\": "test"
+        }
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "0.8.x-dev"

phpunit.xml

@@ -1,10 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="test/bootstrap.php">
-    <php>
-    </php>
+<phpunit 
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+        colors="true"
+        backupGlobals="false"
+        bootstrap="vendor/autoload.php">
+
     <testsuites>
         <testsuite name="SentryBundle test suite">
-            <directory suffix="Test.php">./test</directory>
+            <directory>./test</directory>
         </testsuite>
     </testsuites>
+
 </phpunit>