improved exception on generation failure
tweaked background filter
fixed exception
Merge pull request #321 from digitalkaoz/error_message_improvement

improved exception on generation failure
Merge pull request #319 from digitalkaoz/background_image

added background_image filter
added s3 proxy cache resolver
ProxyResolver now acts as a decorator for every other Resolver
added fix for Symfony2.0
Merge pull request #318 from digitalkaoz/s3_proxy_cache

added proxy cache resolver