o Added the properties opaque and cacheable to tile sources
o Unique tile cache key for every grid setting in RMCoordinateGridSource
o Added -removeAllCachedImagesForCacheKey: to the tile caches
o Added RMCompositeSource for efficiently compositing opaque and non-opaque tile sources
fixes #104: MapBox improvements
o Check for some error conditions
Merge pull request #105 from mapbox/104-mapbox-improvements

fixes #104: MapBox improvements
o Some merge fixes for pull request #105
o Sample projects updates due to pull request #105
o Added the properties opaque and cacheable to tile sources
o Unique tile cache key for every grid setting in RMCoordinateGridSource
o Added -removeAllCachedImagesForCacheKey: to the tile caches
o Added RMCompositeSource for efficiently compositing opaque and non-opaque tile sources
o Check for some error conditions
o Added a new property 'tileSources' to RMCompositeSource
o Added tileSourceForUniqueTilecacheKey: to RMTileSourcesContainer
o Added some methods to better translate between the UIScrollView zoom factor and the tile sources zoom level
o Some merge fixes
o Refactored adjustTilesForRetinaDisplay to slice the tile images instead of setting a different tile size for the CATiledLayer
Merge branch 'release' into develop