fuckyeah arrow render thing fizxed

took a combination of changes. One using a data watcher to Re se the
shooting entity, and another usinga super.onupdate sorta method.  Neth
arrow now extends  vanilla arrow entity.

http://www.minecraftforge.net/forum/index.php/topic,18973.msg95890.html#msg95890

http://www.minecraftforge.net/forum/index.php?topic=16368.0