[WatchKit] Update template for new IB gem.

lib/motion/project/template/ios-watch-extension/files/Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
 gem 'rake'
+gem 'ib', '>= 0.7.0'
 # Add your dependencies here:
-gem 'ib'

lib/motion/project/template/ios-watch-extension/files/Rakefile.erb

@@ -11,3 +11,9 @@ end
 Motion::Project::App.setup do |app|
   # Use `rake config' to see complete project settings.
 end
+
+require 'ib/tasks'
+
+IB::RakeTask.new do |project|
+  project.resource_directories = ['watch_app']
+end