Convert client applications fixtures into a factory

Closes #1415

test/factories/client_applications.rb

@@ -0,0 +1,6 @@
+FactoryGirl.define do
+  factory :client_application do
+    sequence(:name) { |n| "Client application #{n}" }
+    sequence(:url) { |n| "http://example.com/app/#{n}" }
+  end
+end