twitter: fix format verb in error

Change-Id: I36e11ac4b506391f8b94c22fa0d28f652ade4a4c
0.8 release: document and force Go 1.3 requirement

http://camlistore.org/issue/485

Change-Id: If5304e6aafee21b77ced4b34ecef29a2a1bd6712
serverinit: allow jsonconfig expansions in high-level configs.

Change-Id: I600fc56b9324143559ba594ed41a391296871689