update marker URL
doc clarifications
fixes #115: add SSL support
refs https://github.com/CocoaPods/CocoaPods/issues/1186
update to modern use of `instancetype`
proper use of `NSTextAlignmentCenter`
integrating CocoaPods fix from @ccarse
formatting
added tile source alpha methods
enhanced customizability for point, polyline, and polygon annotations
extend fill color for general shapes as well
more sane default circle line width
even saner default circle fill color
clarifications
added circle annotation
make RMCircleAnnotation a public header
default to an empty colored MapBox marker, not a star image
make use of auto-retina mode