Adds sponsor model

spec/factories/sponsors.rb

@@ -0,0 +1,11 @@
+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :sponsor do
+    name 'Example sponsor'
+    website_url 'http://www.example.com'
+    description 'Lorem Ipsum Dolor'
+    sponsorship_level
+    conference
+  end
+end