install request helpers even when there are errors

Hello @dpup, @vinibaggio, 

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

9d8592729378abef2f1be39730440823f554d912 (2014-06-18 12:48:27 -0400)
install request helpers even when there are errors

R=@dpup
R=@vinibaggio
the low-level static middleware throws a UriError, and skips the request decorators