foursquare: some attributes cleanup

Change-Id: I7a1d794e58b47edeef06c3d181991c8aa1eb0534
picasa: ignore shard number when comparing URLs for equality.

Change-Id: I9e31756f3f8122f7bc563ba2a2f1e19aee553f65
Merge branch 'master' of https://camlistore.googlesource.com/camlistore