more work on bindings

api/client.go

bindings/client.go

bindings/clientTracker.go

bindings/connect.go

bindings/connectionTracker.go

bindings/contact.go

bindings/delivery.go

bindings/follow.go

bindings/old/README.md

bindings/old/authenticatedChannels.go

bindings/old/backup.go

bindings/old/callback.go

bindings/old/client.go

bindings/old/contact.go

bindings/old/dummy.go

bindings/old/errors.go

bindings/old/errors_test.go

bindings/old/event.go

bindings/old/fileTransfer.go

bindings/old/group.go