Add rake task to create default server.

Author: Kota Fujiwara

lib/tasks/create_servers.rake

@@ -0,0 +1,4 @@
+task :create_servers => [:environment] do
+  Server.create({:name => 'EARTH',:population => 0})
+  Server.create({:name => 'MARS',:population => 0})
+end