refs #1219: move iOS CocoaPods spec to root of project

This is only temporary, until such time that we release Mapbox GL
on CocoaPods directly, when they will host the Podspec. For now,
it needs to be in the repository root to be usable as a non-main
CocoaPods source.

MapboxGL.podspec

@@ -0,0 +1,33 @@
+Pod::Spec.new do |m|
+
+  m.name    = 'MapboxGL'
+  m.version = '0.2.8'
+
+  m.summary          = 'Open source vector map solution for iOS with full styling capabilities.'
+  m.description      = 'Open source OpenGL-based vector map solution for iOS with full styling capabilities and Cocoa bindings.'
+  m.homepage         = 'https://www.mapbox.com/blog/mapbox-gl/'
+  m.license          = 'BSD'
+  m.author           = { 'Mapbox' => 'mobile@mapbox.com' }
+  m.screenshot       = 'https://raw.githubusercontent.com/mapbox/mapbox-gl-native/master/ios/screenshot.png'
+  m.social_media_url = 'https://twitter.com/mapbox'
+
+  m.source = { :http => "http://mapbox.s3.amazonaws.com/mapbox-gl-native/ios/builds/mapbox-gl-ios-#{m.version.to_s}.zip" }
+
+  m.platform              = :ios
+  m.ios.deployment_target = '7.0'
+
+  m.source_files = 'Headers/*.h'
+
+  m.requires_arc = true
+
+  m.resource_bundle = { 'MapboxGL' => 'MapboxGL.bundle/*' }
+
+  m.frameworks = 'CoreLocation', 'CoreTelephony', 'GLKit', 'ImageIO', 'MobileCoreServices', 'QuartzCore', 'SystemConfiguration'
+
+  m.libraries = 'c++', 'sqlite3', 'z'
+
+  m.vendored_library = 'libMapboxGL.a'
+
+  m.xcconfig = { 'OTHER_CPLUSPLUSFLAGS' => '-std=gnu++11 -stdlib=libc++' }
+
+end