migrate to awestruct 0.5.0 w/ Ruby 1.9

Changes necessary to migration to Awestruct 0.5.0.

I highly recommend using Bundler so that you can communicate the dependencies in an automated way. I've also provided a Rakefile that should help contributors get started faster. So long as Rake is on the system, getting setup only requires running:

```
rake setup[local]
```

If you are using RVM, and the gems will install into a sane location in your home directory, then you can use

```
rake setup
```

To run in dev mode, you just run:

```
rake
```

See the migration guide for more information: https://github.com/awestruct/awestruct/wiki/Migrating-to-Awestruct-0.5.0