Minor layout change in nav bar
levels: added help menu entry
levels: minor menu string updates
levels: added simple text based help msg
plugins: added showcaseview
Updated classpath for ShowcaseView
levels: replaced plain text overlay with ShowcaseViews

Looks nicer, but might look similar to other apps ...
levels: removed old help overlay
levels: minor update in menu layout
news: fixed SOE when deleting items twice
news: added swipe to delete
utils: added assert method for bounds checking
news: NewsManager supports adding news items
news: NewsListAdapter handles communication with NewsManager
news: NewsItem implements Comparable
news: added undo to newslist
news: added builder pattern to NewsItem
news: clicking news navigates to fragment
news: fixed NPE when mixing action mode and swiping
news: removed id from NewsItem