fixes #110: properly query local tile sources
bring over fix from #118
Merge branch 'develop' into release
Merge branch 'develop' into release
Merge branch 'develop' into release
fixes #157: attribution improvements & fixes from @ryanmaxwell
Fixes RMShape bezier drawing for below iOS 6.

I just changed use of NAN to INFINITY, which is available in
earlier versions of iOS.
fixes #155: don't crash on nil static map handler
fixes #153: added podspec for direct CocoaPods use
fixes #158: add support for callout subtitle via annotation subtitle
defer to delegate for simplestyle annotation layers if available
update downloads link
update release podspec
link to guide for install options
include more info about sub-libraries used
resolve some very subtle memory problems under non-ARC
fixes #169: allow re-add of annotations
Merge branch 'develop' into release
proper bullets for dependent libraries
link dependent libs