getFanCount() method to GraphPage. (get pagelikes)

[eddieace]

The GraphPage object was missing a get method for fan_count AKA page likes. So I added it.

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[yguedidi]

Thanks @eddieace for your PR and sorry for the delay! Can you please rebase your PR on 5.x and update the changelog file? Thanks!

[eddieace]

Why does this fail on HHVM @yguedidi ?

[yguedidi]

@eddieace I really don't know, I'm not an HHVM expert :(

[yguedidi]

@eddieace mabye close this PR and start a new one on latest 5.x branch?

[SammyK]

@eddieace Thanks for the PR! :)