Added global application config (config.yml) option

'php-censor.build.allow_public_artifacts' for allow/deny to generate
public artifacts (PHPUnit code coverage html report, Pdepend html
reports). Issue #107.

src/PHPCensor/Command/RunCommand.php

@@ -163,7 +163,7 @@ class RunCommand extends Command
                 $build->setStatus(Build::STATUS_FAILED);
                 $build->setFinishDate(new \DateTime());
                 $store->save($build);
-                $build->removeBuildDirectory();
+                $build->removeBuildDirectory(true);
                 continue;
             }