Adds the roughest beginnings of a collection model and adds a single field to northeastern_dublin_core_datastream.rb
Changed generic_file model to include nu_description
Refactored datastream models/specs to live app/models and spec/models for the moment; nesting them in datastream directories was causing problems.  Removed double-inclusion of rspec-rails in the Gemfile; it is now only included for the :development and :test groups.
Merge pull request #41 from nu-lts/feature/flatten_model_directories

Feature/flatten model directories
changed file name because of hydra collision
Merge remote-tracking branch 'origin/develop' into feature/polyfills
Adding HAML to the project and slowly starting to convert the files