Introducing the recommendation attribute for presenting attrs to users
More annotations (optimality, default visibility)
UI work, some improvements to the attribute handling

Numerical attributes now know their optimality criterion (min / max).
Domain specific view code to nicely show common attributes (ugly)
Only show attributes we think are relevant to the user.
Sentiment display, beautifying
Adding rating images
Making AttributeFactory a singleton. Attribute sorting
Adding aspect class and aspect factory
Layout fine tuning
Refactoring to aspect data class; Add laptop sentiment info