#79 Squashing work on API and offline maps from #61 and #73
#79 Clearer property names for including markers & metadata
#79 Previous markers/metadata commit was broken. Fixed it.
#79 Private API using categories on MBXOfflineMapDatabase
#79 Fixed the suspend/resume/cancel glitching
#79 Get OS X sample app to compile again (it’s incomplete though)
#79 Swapping old API for new API, Phase 1
#79 Swapping old API for new API, Phase 2
#79 Made MBXOfflineMapDownloader’s delegate be normal
#79 Made MBXRasterTileOverlay’s delegate less weird. Includes a mechanism to compensate for attempted delegate notifications which happen before the delegate gets set (the normal case for initializing from an offline map).
#79 Fix sample project file prefix
#79 Misc Fixes: dev team, 64bit cast, default for max offline map zoom level
#79 Added property to enable iCloud backups for offline maps
#79 Massive revision of README
#79 More README edits
#79 Yet more README edits
#79 Even more README edits
#79 Another round of README edits
#79 README: conceptual overview, spelling
#79 #65 attribution property and alert dialog