first cut of ARC migration
fix typo
fixes #156: readjust loading tile background after map frame changes
Merge branch 'develop' into arc
remove slight delay when displaying callouts
fixes #189: improvements to annotation selection
 * allow selection of enabled annotations even without callout
 * added selection/deselection delegate methods
 * changed `enabled` -> `isEnabled` getter for MapKit consistency
 * simplification of some code
fix shape/circle hit detection passed on presence of fill color
fix problem with containers views & attribution iteration
Merge branch 'develop' of https://github.com/mapbox/mapbox-ios-sdk into smartmap-mapbox
fixes layer sorting regression introduced in f03045d
Merge branch 'develop' into arc
added ARC branch mention
added ARC notes
fixes #195: added screenshot to README
public/private header cleanup
update ARC podspec
update podspec for development
fix typo
Merge branch 'develop' of github.com:mapbox/mapbox-ios-sdk into develop
refs #197: background/loading image fixes