Add temporary placeholders for hooks data

lib/cocoapods/hooks/library_data.rb

@@ -7,6 +7,10 @@ module Pod
     #
     class LibraryData
 
+      def dependencies
+        []
+      end
+
 
     end
   end

lib/cocoapods/hooks/pod_data.rb

@@ -19,6 +19,12 @@ module Pod
         root_spec.to_s
       end
 
+      def source_files
+        []
+      end
+
+      #--------------------------------------------------------------------------------#
+
     end
   end
 end