Added normalizer to help with concentrates and stones

tests/Helper/NormalizerTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace NoccyLabs\Juicer\Helper;
+
+
+class NormalizerTest extends \PhpUnit\Framework\TestCase
+{
+
+    public function testThatNormalizedPercentagesAreSane()
+    {
+        $normalizer = new Normalizer([
+            'A' => 10
+        ]);
+
+        $this->assertEquals(10, $normalizer->getPercent("A"));
+        $this->assertEquals(100, $normalizer->getNormalizedPercent("A"));
+
+        $normalizer = new Normalizer([
+            'A' => 10,
+            'B' => 10,
+        ]);
+
+        $this->assertEquals(10, $normalizer->getPercent("A"));
+        $this->assertEquals(50, $normalizer->getNormalizedPercent("A"));
+        $this->assertEquals(10, $normalizer->getPercent("B"));
+        $this->assertEquals(50, $normalizer->getNormalizedPercent("B"));
+
+        $normalizer = new Normalizer([
+            'A' => 2,
+            'B' => 8,
+        ]);
+
+        $this->assertEquals(20, $normalizer->getNormalizedPercent("A"));
+        $this->assertEquals(80, $normalizer->getNormalizedPercent("B"));
+
+    }
+}