[ADD] CoreData support added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[ADD] Model for note object added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[ADD] Note class and DataManager

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[ADD] Data request for notes added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[ADD] Prototype table cell added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[ADD] TableView data source and delegate methods added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[FIX] Handling of null objects in dictionary fixed

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[FIX] Interface fixed, table view not under status bar

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[IMPR] Activity indicator layout improved

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>
[FIX] Background updating issue fixed: Background MOC added

Signed-off-by: Dietrich Tegge <dietrich@tegge.eu>