Add back oauth
Merge pull request #2 from venmo/bg/oauth

Bring back oauth support
Merge pull request #3 from venmo/bg/cleanup

Remove cruft
Merge remote-tracking branch 'origin/v2' into bg/renamespace

Conflicts:
	VENAppSwitchSDK/URL Handling/VENURLProtocol.m
	VENAppSwitchSDK/Venmo.h