#166 updated release note.
Bumped version to 0.8.7-SNAPSHOT.
#172 Fixed NullPointer when invoking a setter in constructors of
PresentationModel with AspectJ.
#174 Removed the need of AbstractItemPresentationModel to prevent confusion.
Removed stale proguardAchives configuration.
#170 Implemented safeguard of updates to PresentationModel only executed within UI thread.
#175 Updated version info for v0.8.7 release.