Photo and PhotoCategory models modified; relations between them defined
PhotoCategory moel modified; allNames method added
photos.index view modified; photo category name added to displayed photo data
photo_categories.show view modified; number of photos added to displayed photo category data
photos.show view modified; photo category name added to displayed photo data
photos.show view modified; creation and modification dates added to displayed photo data
photos.create view and PhotoController controller modified; photo category field added to the process of photo creating
photos.edit view and PhotoController controller modified; photo category field added to the process of photo editing
PhotoController controller modified; file deleting added in delete action