update podspec to work with CocoaPods 0.17+
update binary downloads link
update podspec to remove license since have a file, add screenshot
podspec updates for 0.18+
quiet resources build in podspec
fixes #233: only set tile source if valid
re-added license to spec
fixed typo
* Fixed some retain cycles that were preventing the RMMapView from being deallocated.
* Fixed a retain cycle
Merge remote-tracking branch 'onato/develop' into HEAD

Conflicts:
	MapBox.podspec