Update GraphUser.php

The field gender is missing from GraphUser object.
add graph picture

5.4 supported

5.4 supported

remove author tag
add support for re-authentication

add base method makeUrl, and different method to get loginUrls
update description and refactor code
fix 2 space indentation
small fix
Merge pull request #304 from chapsuk/graph_picture

add graph picture
Merge pull request #305 from geodeveloper/patch-2

Update GraphUser.php
Merge pull request #310 from SingularityGuy/master

add support for re-authentication