Upgrade to kew@0.5.0-alpha

Hello @nicks, @x-ma, @sboora, @eford1, 

Please review the following commits I made in branch 'nathan-kew'.

c6a13195bc23f4035337901ab97ba182a4a67745 (2014-09-29 11:03:37 -0700)
Upgrade to kew@0.5.0-alpha
As part of this change, I have removed the call to setImmediate in
favor of using whatever later/nextTick function kew is.

R=@nicks
R=@x-ma
R=@sboora
R=@eford1