return callback always
check loginCallbackId exists before pluginResult call

We make sure that loginCallbackId exists before calling it. When it's not set, it triggers the exception referenced in issue #507
Update FacebookConnectPlugin.m

Tweaked the PRed code to be more inline with Google Objective-C style guide.
Merge pull request #493 from aogilvie/fix/logoutCallback

Return a logout callback always
Merge pull request #1 from aogilvie/patch-2

Update FacebookConnectPlugin.m
Merge pull request #510 from jakecraige/patch-1

check loginCallbackId exists before pluginResult call
fix user.id to pass app validation - http://stackoverflow.com/a/14448057/3130279
Merge pull request #536 from machard/develop

fix user.id to pass app validation - http://stackoverflow.com/a/14448057...