Added parent property to item (doubly linked list);
Added item constructors with parent item as parameter;
Moved onclick listener for browser urls to own class;
Changed webfragment and developerfragment to use new onclick listener class;
Added currentItem to ItemArrayAdapter;
Changed ItemArrayAdapter to use ItemTypes to get the type of the class instead of getClass();
Changed items property to ArrayList<Item>;
Merge branch 'dev' of https://github.com/tectas/buildbox into dev