Fixed issue with videos not loading/converting in QuickTime Player X on OS X Mavericks

This issue may have been caused by a malformed UDTA atom. Either the length was wrong or the "@enc" atom wasn't supported. Either way QuickTime Player X was crashing for Photo PNG and Photo TIFF files.

The header/footer atom structure has been adjusted to conform better with the one QuickTime produces in its own files. Most of the information is in the footer now.

README updated.

Newer version of QuickTime specifications PDF.

Signed-off-by: horchler <adh9@case.edu>