Refactoring of black_outs_controller
Re-factored file deletion to an extra method, added versatility wrt asset types
Refactored @equipment_model selection by id into separate method called as before_filter for relevant RESTful actions
Fixed #368 in seeds.rb
improved naming of before_filter method, added todo comment
Merge pull request #370 from YaleSTC/365_equipment_models_controller_refactoring

#365 & #368: Refactor EquipmentModelsController, fix file location