update Copyright year from 2013 to 2014

Signed-off-by: Jovi Zhangwei <jovi.zhangwei@gmail.com>
update tutorial

Signed-off-by: Jovi Zhangwei <jovi.zhangwei@gmail.com>
minor cleanup

Signed-off-by: Jovi Zhangwei <jovi.zhangwei@gmail.com>