Error on using cleaning asset_strategy

The comand that removes/cleans the assets is getting an error.
Mostly because the command is too long.

` engineyard-serverside-2.6.14/lib/engineyard-serverside/spawner.rb:125:in exec: Argument list too long `

I checked the source code and its joining the files to be removed.

````
//engineyard-serverside/lib/engineyard-serverside/rails_assets/strategy.rb
remove_assets = []
(assets_on_disk - assets_in_manifest).each do |asset|
remove_assets << "'#{asset}'"
remove_assets << "'#{asset}.gz'" if all_assets_on_disk.include?("#{asset}.gz")
end
run("rm -rf #{remove_assets.join(' ')}")
````