Fix bug that would only add files to the xcode project that are on disk, before…

Fix bug that would only add files to the xcode project that are on disk, before downloading newer dependencies.

lib/cocoapods/installer.rb

@@ -51,10 +51,12 @@ module Pod
       end
     end
 
+    # TODO we need a spec that tests that all dependencies are first downloaded/installed
+    # before #generate_project is called!
     def install!
       puts "Installing dependencies of: #{@specification.defined_in_file}" unless config.silent?
-      generate_project
       build_specification_sets.each { |set| set.specification.install! }
+      generate_project
       xcodeproj.create_in(config.project_pods_root)
       xcconfig.create_in(config.project_pods_root)
     end