Added examples, improved recipe implementation

examples/bases.php

@@ -0,0 +1,32 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Juicer\Ingredient\Base;
+use NoccyLabs\Juicer\Ingredient\NicotineBase;
+
+printf("Apparent Specific Gravity of base mixes:\n\n");
+printf("   VG   | PG   | ASG\n");
+printf("  ------|------|------------------------\n");
+for ($pg = 0; $pg < 100; $pg += 10) {
+    $base = new Base("PG{$pg}");
+    printf("   %3d%% | %3d%% | %.4fg/mL\n", 100-$pg, $pg, $base->getSpecificGravity());
+}
+
+echo "\n\n";
+
+$asgstrength = [ 24, 20, 18, 15 ];
+$asgheader = join("", array_map(function ($s) { return sprintf("%2dmg    ", $s); } , $asgstrength));
+
+printf("Apparent Specific Gravity of nicotine bases:\n\n");
+printf("   VG   | PG   | %s\n", $asgheader);
+printf("  ------|------|-------------------------------------\n");
+for ($pg = 0; $pg < 100; $pg += 10) {
+    printf("   %3d%% | %3d%% |", 100-$pg, $pg);
+    $base = new Base("PG{$pg}");
+    foreach($asgstrength as $s) {
+        $nicbase = new NicotineBase($base, $s);
+         printf(" %6.4f ", $nicbase->getSpecificGravity());
+    }
+    printf("\n");
+}