Bump version number to 0.13
Bump version number to 0.13

git-svn-id: 2223166f32dfc0252f77f60c9446e3f27730b4ad@17 8ba0a3ab-1543-0410-831c-f9a674249a0d

untereiner/pexif,bennoleslie/pexif,ebrelsford/pexif