Merge branch '5.0' into 5.1

Author: sebastianbergmann

.gitattributes

@@ -1,4 +1,13 @@
-/build export-ignore
+/build*             export-ignore
+/*.md               export-ignore
+/LICENSE            export-ignore
+/*.xml              export-ignore
+/*.xsd              export-ignore
+/tests              export-ignore
+/.gitattributes     export-ignore
+/.gitignore         export-ignore
+/.php_cs            export-ignore
+/.travis.yml        export-ignore
+
 *.php diff=php
-composer.json merge=ours
-src/Runner/Version.php merge=ours
+