[+]: ".gitattributes" <- prevent installing special files via composer

[*]: add missing phpdoc

.gitattributes

+* text=auto
+
+/tests export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.travis.yml export-ignore
+/phpunit.xml.dist export-ignore
+/run-tests.sh export-ignore

src/JWT.php

@@ -130,6 +130,7 @@ class JWT
      *                                  If the algorithm used is asymmetric, this is the private key
      * @param string        $alg        The signing algorithm.
      *                                  Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
+     * @param mixed         $keyId
      * @param array         $head       An array with header elements to attach
      *
      * @return string A signed JWT