initial stab at adding blueprints

1. adding new blueprint resource and
2. adding two new blueprints-related endpts in cluster resource
fixing return of create cluster from blueprint
adding status field to request resource
adding tests for blueprints
minor cleanup
version bump and adding multi_json dependency
updating README
wip adding methods to facilitate working with blueprints as well as process single json file
adding some error handling around file opening and parsing json in create_cluster_from_json
eric/travis code review
Merge pull request #1 from infochimps-platform/add_support_for_blueprints

Add support for blueprints