* Introduced NetworkViewRenderer interface to manage multiple renderers.

Change-Id: I7753a95c9595b669efe077866f61fe241d00beeb
 * Cleaned up multiple renderer API
 * Decoupled core UI implementation from Ding

Change-Id: I1812cdda39769616085d6f398c0f048fdde015a4
Added API for setting/getting default NetworkViewRenderer

Change-Id: I6647dbe72e099849a090125d01c2b6f4c66c8431
Merge branch 'multiple_renderers' into develop