Fixed some minor formatting issues.

* composer.json (partially) uses tabs, other code does not.
* password.php generally seems to use 4 spaces for indentation, just not in two spots.
* version-test.php lacks a trailing newline.

No functional changes.  Proof:

```diff
$ git diff -b master
diff --git a/composer.json b/composer.json
index 637cbdd..ee79fd0 100644
--- a/composer.json
+++ b/composer.json
@@ -16,6 +16,8 @@
         "phpunit/phpunit": "4.*"
     },
     "autoload": {
-               "files": ["lib/password.php"]
+        "files": [
+            "lib/password.php"
+        ]
     }
 }
```