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LibGFBGraph 0.2.4
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The changes include:

- Change Facebook Graph API version to v2.10 by Álvaro Peña.
- Fix memory leaks of GFBGraphNode class by Krzesimir Nowak.
- Support g_autoptr for GFBGraphAlbum, GFBGraphNode, GFBGraphPhoto,
  GFBGraphUser by Leesoo Ahn.
- Fix memory leaks of GFBGraphUser, GFBGraphSimpleAuthorizer,
  GFBGraphAlbum by Leesoo Ahn.