Version of RocketAMF that works with Rails3-AMF

Applied suggested fix for ruby versions prior to 1.8.7

- Created RocketAMF::Envelope from RocketAMF::Request and RocketAMF::…

…Response so that users can now make remoting requests using �RocketAMF

- Fix some bugs

- Add Ruby 1.9 support alongside Ruby 1.8 support

- Add support for ArrayCollection serialization and deserialization
- Add support for XML deserialization
- Add support for flash.util.Dictionary deserialization
- Improve documentation a little

Bump version

Pushed out new release to gemcutter

Pushed to gemcutter

Updated specs and fixed Rakefile so it includes fixtures in gem builds

Added AMF0 serializer and fixed several major implementation bugs in …

…the middleware