fixed Exception use statements

core/Development.php

@@ -9,7 +9,7 @@
 
 namespace Piwik;
 
-use \Exception;
+use Exception;
 
 /**
  * Development related checks and tools. You can enable/disable development using `./console development:enable` and

core/Plugin/Report.php

@@ -18,7 +18,7 @@ use Piwik\Plugins\CoreVisualizations\Visualizations\HtmlTable;
 use Piwik\Translate;
 use Piwik\WidgetsList;
 use Piwik\ViewDataTable\Factory as ViewDataTableFactory;
-use \Exception;
+use Exception;
 
 /**
  * Defines a new report. This class contains all information a report defines except the corresponding API method which

tests/PHPUnit/IntegrationTestCase.php

@@ -7,6 +7,7 @@
  */
 namespace Piwik\Tests;
 
+use Exception;
 use Piwik\API\DocumentationGenerator;
 use Piwik\API\Proxy;
 use Piwik\API\Request;