ui: added 'View original' link to sidebar

Notes:
-this patch also introduces the sidebar to the contents listing aspect (when viewing members of a set)
-the link will only appear for a _single_ selected item

https://code.google.com/p/camlistore/issues/detail?id=541
https://code.google.com/p/camlistore/issues/detail?id=546

Change-Id: Icc93eaa2478f40f3fe272520b1f6ede41f0731dc
Merge "ui: added 'View original' link to sidebar"
pkg/deploy/gce/http: web wizard to deploy on Google Cloud

http://camlistore.org/issue/531

Change-Id: I47900eb7b82b7775ec1d26b1d6796e5701ee672d
wip csrf

Change-Id: I8a24b39c95cff692acaeca9bc09e013f869e6b3f