Use APPLICATION_EXTENSION_API_ONLY for watchOS 2 extensions

lib/cocoapods/installer.rb

@@ -603,7 +603,7 @@ module Pod
       frameworks_group = pods_project.frameworks_group
       aggregate_targets.each do |aggregate_target|
         is_app_extension = !(aggregate_target.user_targets.map(&:symbol_type) &
-          [:app_extension, :watch_extension]).empty?
+          [:app_extension, :watch_extension, :watch2_extension]).empty?
 
         aggregate_target.pod_targets.each do |pod_target|
           configure_app_extension_api_only_for_target(aggregate_target) if is_app_extension

spec/unit/installer_spec.rb

@@ -576,6 +576,10 @@ module Pod
           test_extension_target(:watch_extension)
         end
 
+        it 'configures APPLICATION_EXTENSION_API_ONLY for watchOS 2 extension targets' do
+          test_extension_target(:watch2_extension)
+        end
+
         it 'does not try to set APPLICATION_EXTENSION_API_ONLY if there are no pod targets' do
           lambda do
             mock_user_target = mock('UserTarget', :symbol_type => :app_extension)