Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/markbaker/complex/classes/src/functions/tanh.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ *
+ * Function code for the complex tanh() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the hyperbolic tangent of a complex number.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    Complex          The hyperbolic tangent of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ * @throws    \InvalidArgumentException    If function would result in a division by zero
+ */
+function tanh($complex)
+{
+    $complex = Complex::validateComplexArgument($complex);
+    $real = $complex->getReal();
+    $imaginary = $complex->getImaginary();
+    $divisor = \cos($imaginary) * \cos($imaginary) + \sinh($real) * \sinh($real);
+    if ($divisor == 0.0) {
+        throw new \InvalidArgumentException('Division by zero');
+    }
+
+    return new Complex(
+        \sinh($real) * \cosh($real) / $divisor,
+        0.5 * \sin(2 * $imaginary) / $divisor,
+        $complex->getSuffix()
+    );
+}