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Ella gallery application
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Gallery application is typicaly used for encapsulating photo gallery, but in
fact it can carry any object that can be presented in any way to the end user.


Features
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- Every gallery item is given a slug unique in certain gallery.
- Every item can be accessed by that unique slug
- Galleries can carry any set of meaningful objects (set of articles,
	contests, ...)


Data models
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Gallery application consists of two basic data models.

- Gallery: Holds gallery meta information (name, slug, etc..)
- GalleryItem: Implements relation between specific Gallery and any data model
	from any other application (but usualy photos.Photo)

