Upgrade to kew@0.5.0-alpha

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

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

9964976774154d423a0269f752dfa4bf5d1eeecc (2014-09-29 10:54:16 -0700)
Upgrade to kew@0.5.0-alpha

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