Add Meter component folder (haml and rb). Add Spec for meter

Author: bdlb77

app/concepts/matestack/ui/core/meter/meter.haml

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+%meter{@tag_attributes}
+  - if block_given?
+    = yield

app/concepts/matestack/ui/core/meter/meter.rb

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+module Matestack::Ui::Core::Meter
+  class Meter < Matestack::Ui::Core::Component::Static
+  end
+end

spec/usage/components/meter_spec.rb

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+require_relative '../../support/utils'
+include Utils
+
+describe 'Meter Component', type: :feature, js: true do
+
+  it 'Renders an meter tag on the page' do
+
+    class ExamplePage < Matestack::Ui::Page
+      def response
+        components {
+          label for: 'meter_id'
+          meter id: 'meter_id', value: 0.6
+
+          label for: 'meter'
+          meter id: 'meter', min: 0, max: 10, value: 6 do
+            plain '6 out of 10. 60%.'
+          end
+        }
+      end
+    end
+
+    visit '/example'
+
+    output_html = page.html
+
+    expected_output = <<~HTML 
+      <label for="meter_id"></label>
+      <meter id="meter_id" value="0.6"></meter>
+
+      <label for="meter"></label>
+      <meter id="meter" min="0" max="10" value="6">
+        6 out of 10. 60%.
+      </meter>
+    HTML
+    binding.pry
+
+    expect(stripped(output_html)).to include(stripped(expected_output))
+  end
+end