Added measurement, readout and readout_value models

commands:
rails generate redmine_plugin_model body_tracking measurement
name:string hidden:boolean source:references
rails generate redmine_plugin_model body_tracking readout
measurement:references quantity:references unit:references
rails generate redmine_plugin_model body_tracking readout_value
readout:references value:decimal taken_at:timestamp

app/models/measurement.rb

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+class Measurement < ActiveRecord::Base
+end

app/models/readout.rb

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+class Readout < ActiveRecord::Base
+end

app/models/readout_value.rb

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+class ReadoutValue < ActiveRecord::Base
+end

db/migrate/003_create_measurements.rb

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+class CreateMeasurements < ActiveRecord::Migration
+  def change
+    create_table :measurements do |t|
+      t.string :name
+      t.boolean :hidden
+      t.references :source, index: true, foreign_key: true
+    end
+    add_index :measurements, :source_id
+  end
+end

db/migrate/004_create_readouts.rb

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+class CreateReadouts < ActiveRecord::Migration
+  def change
+    create_table :readouts do |t|
+      t.references :measurement, index: true, foreign_key: true
+      t.references :quantity, index: true, foreign_key: true
+      t.references :unit, index: true, foreign_key: true
+    end
+    add_index :readouts, :measurement_id
+    add_index :readouts, :quantity_id
+    add_index :readouts, :unit_id
+  end
+end

db/migrate/005_create_readout_values.rb

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+class CreateReadoutValues < ActiveRecord::Migration
+  def change
+    create_table :readout_values do |t|
+      t.references :readout, index: true, foreign_key: true
+      t.decimal :value
+      t.timestamp :taken_at
+    end
+    add_index :readout_values, :readout_id
+  end
+end

test/unit/measurement_test.rb

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+require File.expand_path('../../test_helper', __FILE__)
+
+class MeasurementTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end

test/unit/readout_test.rb

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+require File.expand_path('../../test_helper', __FILE__)
+
+class ReadoutTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end

test/unit/readout_value_test.rb

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+require File.expand_path('../../test_helper', __FILE__)
+
+class ReadoutValueTest < ActiveSupport::TestCase
+
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end