Adds comments about required filters
Removes else statement from MongoDbImageStore
Adds a public notAcceptable method to PhotoViewer
Moves ImageStore facade into the right directory
Moves PhotoView facade into the facades directory
Renames PhotoViewer to PhotoView
Adds an ImageFactory facade
Renames PhotoView to ImageView
Adds a filter class to test that an Image exists
Adds functionality to ImageExistsFilter
still got a problem with mocking ImageStore
Adds a different base class for ImageExistsFilter test which allows it to mock facades
Merge branch 'dev/request-filters'