Make The Rails Asset Pipeline Always Use a File Cache

Stuff this in e.g. config/environments/development.rb to make Rails asset pipeline always use a file cache: ```ruby config.assets.cache_store = :file_store, "tmp/asset-pipeline" ``` Even better, don't use the Rails asset pipeline (sprockets): \* [Gulp.js](http://gulpjs.com/) \* [Grunt.js](http://gruntjs.com/) \* [Broccoli](https://www.npmjs.org/package/broccoli) \* [Goodbye, Sprockets! A Grunt-based Rails Asset Pipeline ](http://blog.pedago.com/2014/01/21/goodbye-sprockets-a-grunt-based-rails-asset-pipeline/)