add support_libraries option for android Rakefile config

lib/motion/project/template/android.rb

@@ -37,6 +37,17 @@ task :build do
   app_build_dir = App.config.versionized_build_dir
   mkdir_p app_build_dir
 
+  # support libraries
+  extras_folder = File.join(App.config.sdk_path, 'extras')
+  App.config.support_libraries.each do |support_library|
+    library_folder = File.join(extras_folder, support_library.split('-'), "\"#{support_library}\".jar")
+    if File.exist?(library_folder)
+      App.config.vendor_project(:jar => library_folder)
+    else
+      App.fail "We couldn’t fail #{support_library} in #{extras_folder}. Use #{File.join(App.config.sdk_path, 'tools', 'android')} to install it."
+    end
+  end
+
   # permissions
   permissions = Array(App.config.permissions)
   if App.config.development?

lib/motion/project/template/android/config.rb

@@ -95,7 +95,7 @@ module Motion; module Project;
     variable :sdk_path, :ndk_path, :package, :main_activity, :sub_activities,
       :api_version, :target_api_version, :arch, :assets_dirs, :icon,
       :logs_components, :version_code, :version_name, :permissions, :features,
-      :services, :application_class, :manifest, :theme
+      :services, :application_class, :manifest, :theme, :support_libraries
 
     # Non-public.
     attr_accessor :vm_debug_logs, :libs
@@ -235,6 +235,10 @@ module Motion; module Project;
       @target_api_version ||= latest_api_version
     end
 
+    def support_libraries
+      @support_libraries ||= []
+    end
+
     def versionized_build_dir
       sep = spec_mode ? 'Testing' : build_mode_name
       File.join(build_dir, sep + '-' + api_version)