Allow individual XMP metadata parameters to be overridden.
Allow individual XMP metadata parameters to be overridden.

mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,psteph801/psteph801.github.io,mpetroff/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum