Referral chain:
There is an issue with globing and precompiling assets. https://github.com/twbs/bootstrap-sass/issues/863
If you must precompile your js and css assets:
Rails.application.config.assets.precompile += [proc { |filename, path| path =~ /(app|lib|vendor)\/assets/ && ['.js', '.css'].include?(File.extname(filename)) }]
Basically this proc will look in app lib and vendor folders for your assets.
Also, used a section of the Rails Guide to come up with this code