Add new methods to EasyAdapter and EasyRecyclerAdapter:

• getItems(): Access the underlying List of data items so there is more flexibility to interact with the Adapter.
• removeItem(T item): Removes a given item from the adapter and refreshes the AdapterView or RecyclerView
• removeItems(Collection items): Same as above but for a collection of items.
• addItems(Collection items): Add a Collection of items and refreshes the AdapterView or RecyclerView
• setItemsWithoutNotifying(List): Same as setItems(List) but this method does not call notifyDataSetChanged()