New pkg/depcheck package to check Go version.

Based on kr's example (syntantically valid Go code, to make cmd/go happy, but
will fail to compile and include the failure text)

Change-Id: I11f9eeabf6bf2c77055752014c71183b7eb7b23a
My import of picasa was failing because the number of photos
returned by the API was different (by one) than the number of
photos claimed in the top-level NumPhotos attribute.

Instead of relying in the NumPhotos attribute, just keep
requesting until we get a response with nothing in it.

This is also more robust against the (admitted edge-case of
the album contents changing while the importer is running.

Change-Id: Id928a6526e2805aa64e2e59828e2575235bcf9b9
server/ui: do checkType before conf.Validate

Change-Id: I9167cad044ecd2539925ec83f2be519e2b07d0aa
Merge "My import of picasa was failing because the number of photos returned by the API was different (by one) than the number of photos claimed in the top-level NumPhotos attribute."
Hide contents view on empty permanodes.

Otherwise, we end up showing a stupid empty contents view for every
tweet, foursquare checkin, etc.

This has the downside that when you remove the last item from a
set, the contents view goes away.

Change-Id: If5f53a713aaff63d9fb294b675a5e55ca452eff1
Merge remote-tracking branch 'origin/master' into vthumbnails
refactor tests
fix loopbackip
auth
cosmetics