Fixed warnings when open_basedir directive set
Removed GET processing from CanvasLoginHelper.
Merge pull request #185 from SammyK/fix-for-open_basedir-directive

Fixed warnings when open_basedir directive set
Merge pull request #194 from facebook/gFosco.canvasGET

Removed GET processing from CanvasLoginHelper.
Updated visibility of FacebookSession::
Merge pull request #196 from facebook/gFosco.session-appsecret

Updated visibility of FacebookSession::useAppSecretProof
Updated testing version constraints
Merge pull request #198 from GrahamCampbell/patch-1

Updated testing version constraints
Refactored request/response.