Fixes mapbox/mapbox-ios-sdk/#337
this seems rather unfortunate
fixes #359: add contribution guidelines
fixes #382: add log line when using watermarked maps
refs #331: disable user tracking when selecting an annotation
Merge branch 'release' into develop
fixes #391: remove debug flags which make debugging difficult
fix taking out logo bug per @mrzoidberg
refs #350: properly update constraints for logo & attribution
refs #260: fix up attribution button toggling
refs #264: don't try to add nil annotations
fixes #338: properly VACUUM after flushing cache
refs #388: update spec email
fixes #289: use vendored_libraries attribute
refs #349: documentation CocoaPods attribute is deprecated
Update Mapbox.podspec

GRMustache was not updated, but the submodule was.
Merge commit '3287fe27e369f30aacd33e333c7431217ff9870a' into develop