updated the project to DropWizard version  0.7.0  and migrated package structure from yammer to codahale

Hi, I'm upgrading your swagger project to newest DropWizard...
The .idea folder you can ignore... those are file from my IDE.

Will submit a pull request too for your swagger dropwizard project... feel free to apply.
But please let me know if you're not interested, I might host the changes on my own maven repo's so I can easily integrate them in my projects.

Best wishes,

Jochen