Comment 1 for bug 1367405

Right now, rotations are not being loaded from the metadata, so, to fix this, I have to:

1) Implement a method to extract rotations from metadata
2) Implement a method to save rotations in metadata
3) Use it in the Cairo Picture WIdget (I need a new name for that widget hehe)

For other kind of editions that can't be saved in the metadata is more work, because I think it's not that easy as editing a pixbuf and save it, becuse the metadata will be lost (not sure of this). So, a solution is to implement a save() method in Photo.vala that extract all the metadata, replaces the file and then asign the extracted metadata to the new file.