Add validation of load profiles
user
```ruby
require 'spec_helper'

describe 'Load profiles' do
  Atlas::Dataset.all.each do |dataset|
    describe "for #{ dataset.key.upcase }" do
      Pathname.glob(dataset.dataset_dir.join('load_profiles/*.csv')) do |file|
        it "#{ file.basename } does not permit CR (\\r) line endings" do
          message = "expected #{ file.relative_path_from(Atlas.data_dir) } " \
                    "to not have CR line endings"

          expect(file.read).to_not match(/\r[^\n]/), message
        end

        it "#{ file.basename } should something" do
          values    = File.foreach(file).map(&:to_f)
          in_joules = values.reduce(:+) * 3600

          # The sum of the values in the load profile ought to equal 1.0 / 3600
          # since the load profile will implicitly convert values from ETEngine,
          # which are in Joules, into watthours.
          expect(in_joules).to be_within(1e-3).of(1.0)
        end # something
      end # each profile
    end # for dataset
  end # each dataset
end # Load profiles
```
assistant