VDKBase64->VDKBase64
Renamespace encryption classes
Renamespace VENPermission and VENSession
Final renamespacing
VenmoSDK -> Venmo
Merge remote-tracking branch 'origin/v2' into bg/renamespace

Conflicts:
	VENAppSwitchSDK/URL Handling/VENURLProtocol.m
	VENAppSwitchSDK/Venmo.h
Merge pull request #4 from venmo/bg/renamespace

VDK -> VEN