Store gallery photo names in datasets for easier iterating

_data/gallery/2013-edinburgh.yml

@@ -0,0 +1,37 @@
+- 482452e
+- b091e3f
+- 80db970
+- 725d113
+- 1197f83
+- 958772b
+- 6d39d8f
+- f7a009b
+- 293521a
+- e8d614b
+- 1e7fe9e
+- 1967c83
+- 1150f6d
+- f7fcc6a
+- 6237d8c
+- 42f26ff
+- b282557
+- ed9f15f
+- 82fe1cd
+- a041855
+- e78a2ea
+- 5c8bc06
+- 0d8e788
+- c395de3
+- 37c6ca8
+- 931fc98
+- 0ac0e6b
+- af8ee50
+- 69a7569
+- c1e7287
+- e0ef82c
+- 721d526
+- 516bb78
+- ce33533
+- 0b27ad7
+- a8cd357
+- c6408ed