Cache run_config on first reference
Cache run_config on first reference

Only compute run_config on the first call, so that it can be inspected and
modified by the application initializers.

merqlove/requirejs-rails,getaroom/requirejs-rails,tributech/requirejs-rails,appfolio/requirejs-rails,sun16/requirejs-rails,lsimoneau/requirejs-rails,getaroom/requirejs-rails,jwhitley/requirejs-rails,ipmobiletech/requirejs-rails,andrewtimberlake/requirejs-rails,ipmobiletech/requirejs-rails,skroutz/requirejs-rails,skroutz/requirejs-rails,skroutz/requirejs-rails,ipmobiletech/requirejs-rails,lsimoneau/requirejs-rails,merqlove/requirejs-rails,jwhitley/requirejs-rails,aar0nTw/requirejs-rails-sp,sun16/requirejs-rails,skroutz/requirejs-rails,describeit/requirejs-rails,andrewtimberlake/requirejs-rails,aar0nTw/requirejs-rails-sp,describeit/requirejs-rails,crashlytics/requirejs-rails,leppert/requirejs-rails,getaroom/requirejs-rails,andrewtimberlake/requirejs-rails,tributech/requirejs-rails,merqlove/requirejs-rails,merqlove/requirejs-rails,appfolio/requirejs-rails,jwhitley/requirejs-rails,sun16/requirejs-rails,bogwro/requirejs-rails,MediaFactual/requirejs-rails,MediaFactual/requirejs-rails,tributech/requirejs-rails,MediaFactual/requirejs-rails,crashlytics/requirejs-rails,ipmobiletech/requirejs-rails,andrewtimberlake/requirejs-rails,tributech/requirejs-rails,sun16/requirejs-rails,lsimoneau/requirejs-rails,describeit/requirejs-rails,bogwro/requirejs-rails,lsimoneau/requirejs-rails,airbnb/requirejs-rails,jwhitley/requirejs-rails,appfolio/requirejs-rails,getaroom/requirejs-rails,airbnb/requirejs-rails,MediaFactual/requirejs-rails,appfolio/requirejs-rails,describeit/requirejs-rails,leppert/requirejs-rails