Support Facebook app URL suffixes. See Singly/iOS-SDK#96
Typo
Remove superfluous log
catch nil return error
Merge pull request #97 from djz-code/fb_url_suffix

Added support for Facebook URL suffixes.
Merge pull request #101 from slevin/catch-network-error

Catch errors if the response from Singly is nil.
Merge pull request #104 from glennfu/upstream

Fixes a WebView auth crash when hitting cancel right away.
Updates to the changelog and contributors files.
Separate 'can open facebook app' from 'open facebook app' to allow showing a spinner before switching apps