run compile assets as part of initial_setup

closes CORE-1981

test plan
 - rake db:initial_setup should run

Change-Id: I4ddebf513a4b75c7aa4ca16d9126198ced2acfc6
Reviewed-on: https://gerrit.instructure.com/170486
Tested-by: Jenkins
Reviewed-by: James Williams <jamesw@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>

lib/tasks/db_load_data.rake

@@ -203,6 +203,7 @@ namespace :db do
 
   desc "Useful initial setup task"
   task :initial_setup => [:generate_security_key] do
+    Rake::Task['canvas:compile_assets'].invoke
     Rake::Task['db:migrate:predeploy'].invoke
     ActiveRecord::Base.connection.schema_cache.clear!
     ActiveRecord::Base.all_models.reject{ |m| m == Shard }.each(&:reset_column_information)