Used inheritence for RssReaderListAdapter and made settings activity

Used inheritence for RssReaderListAdapter to extend 2 classes
RssReaderListAdapterNews, RssReaderListAdapterFixtures making the code
better and more usable. Introduced abstract brain() function in
RssReaderListAdapter to handle clicks in sub classes and abstract
hideURL() to decide whether to show or hide the URL field in the list
of RSS AND
made settings activity (Still partial only) with one toggle button for
start up chant.