Adding more needed development dependencies, bumping gem version
v2.3.0 - Ruby 1.9 support
v18.104.22.168 - Removed stupid S3 Deprec warning
v2.2.8: Restored the ability to assign nil to delete.
Fix for Rails 2.3
Moved the matchers to fix issues with requiring
Processors are passed the attachment object, and more options are abl…
…e to be procs (url, path, and styles)