Squashed '3.0/modules/date_tag/' content from commit 0a94df7

git-subtree-dir: 3.0/modules/date_tag
git-subtree-split: 0a94df70e809bc3d16cff0133ce06401f3fa83c4
Merge commit '5af4ce81e3bb64a1a7908d06e290997229e68ab7' as '3.0/modules/date_tag'
Count the number of photo items only
Merge pull request #139 from mikeage/date_tag

Proposed new module: Date tag