BulkImportInstitution + Rake #9 [WIP]

not a good idea to use class method, case method resists refactoring. Ideally, this should be done as instance method:

```ruby
class Blahlah
  attr_reader :results_file
  def initialize(results_file)
    @results_file = results_file
  end

  def self.perform # or self.run
    # blah blah
  end
end
```