Create recycler adapter and example

1) Created an advanced RecyclerAdapter in the Demo to instruct people on how to use the RecyclerView.Adapter straight from the android sdk.
2) Created a simplified RecyclerAdapter in the Demo that extends from a newly created RecyclerSwipeAdapter that was created in the library.
3) Created a RecyclerViewExample activity to demonstrate the simplifies approach as well as using TwoWayView library with RecyclerView.
4) Update Library components concerning the RecyclerView and pulled the Mode attribute out to a util package.