Optimisations

- Fixed issue with `InputFile` not setting file-name properly.
- Fixed issue with `InputFile` not setting the correct index when
posting certain arrays.
- Made Csrf-token cookie provider more versitile by creating new
`CookieTokenProvider` and `ITokenProvider` classes.
- Strict-checks optimisations.
- Updated documentation to reflect new changes.

src/Pecee/Http/Security/ITokenProvider.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Pecee\Http\Security;
+
+interface ITokenProvider
+{
+
+    /**
+     * Refresh existing token
+     */
+    public function refresh();
+
+    /**
+     * Validate valid CSRF token
+     *
+     * @param string $token
+     * @return bool
+     */
+    public function validate($token);
+
+}