THIS IS A BETA RELEASE

fixes #359 and #357

bug fixes relating to ScaleMode, including #335, #337, #338

Improved rendering strategy. This should render more predictably, more consistently, and with much less memory consumption. Instead of layered Views, all tiles are drawn to a single Canvas; additionally tiles from previous levels are compared to existing draw operation to determine if any pixels of the previous tile will be seen (e.g., an as-yet rendered tile from the most current level; a partially opaque tile from the current level, etc).

Some APIs have been deprecated, most notably shouldRecycleBitmaps - bitmaps are always recycled now.

Other changes should be largely internal and not noticed by most users, and should generally considered to be non-breaking, however some changes could be noticed (for example, TileCanvasViewGroup no longer has TileCanvasView children - or any children - so if an existing app uses TileView.getTileCanvasViewGroup().getChildAt(0), the result would now be null.

Changes that could be considered breaking:

• TileCanvasView has been removed
• TileCanvasViewGroup is no longer extends ScalingLayout, or implement TileCanvasView.TileCanvasDrawListener
• Tile.stampTime is deprecated and now a no-op