QuietAssets

Rails 3.* logs assets in the output from rails server. These messages are pretty verbose. Adding this gem to your project's Gemfile will suppress those messages.

group :development do
  gem 'quiet_assets', git: '[email protected]:AgilionApps/quiet_assets.git', tag: 'v0.1.0'
end

Credits

Lifted from: http://stackoverflow.com/questions/6312448/how-to-disable-logging-of-asset-pipeline-sprockets-messages-in-rails-3-1/7508407#7508407