Examples fails to compile

[shrkamat]

go-dash$ make examples-ondemand
# command-line-arguments
examples/ondemand.go:15:55: not enough arguments in call to audioAS.AddNewContentProtectionSchemeWidevineWithPSSH
        have ()
        want ([]byte)
examples/ondemand.go:25:55: not enough arguments in call to videoAS.AddNewContentProtectionSchemeWidevineWithPSSH
        have ()
        want ([]byte)
Makefile:38: recipe for target 'examples-ondemand' failed
make: *** [examples-ondemand] Error 2

[stuarthicks]

Fixed in #54