in src/_plugins/asset_bundler.rb [67:78]
def add_file_by_type(file)
if file =~ /\.([^\.]+)$/
type = $1.downcase()
return if Bundle.supported_types.index(type).nil?
if !@files.key?(type)
@files[type] = []
end
@files[type].push(file)
end
end