Release new plovr version

Hello @dpup, @x-ma, 

Please review the following commits I made in branch 'nick-release'.

54c8d4797967bda2f397f964c51f118181ad5531 (2013-05-15 14:33:41 -0400)
Release new plovr version

23e2188164b70fe3494c3f28f4b25f9585662347 (2013-05-15 14:31:29 -0400)
use closure-templates-src instead of closure-templates

R=@dpup
R=@x-ma