v4.2.0

• Added isEmpty().
• Added new constructor to initialize list items [See #12].
• Moved onDeletedConfirmed() in a new listener to pass as parameter to the method startUndoTimer() [See #10].
• Deprecated OnUpdateListener and some relative functions.
• Note: updateDataSetAsync() has been deprecated and will be removed soon from next major version. Use updateDataSet() instead.
  FilterAsyncTask will not be used anymore to load data at startup: there's no advantage to use an Asynchronous loading,
  usually the list is already loaded Asynchronously somewhere else.
• Removed static declaration from the following methods: hasSearchText(); getSearchText(); setSearchText(String searchText).
• Adapted example App accordingly.