Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Helper/SampleTest.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Helper;
+
+use PhpOffice\PhpSpreadsheet\Helper\Sample;
+use PHPUnit\Framework\TestCase;
+
+class SampleTest extends TestCase
+{
+    /**
+     * @runInSeparateProcess
+     * @preserveGlobalState disabled
+     * @dataProvider providerSample
+     *
+     * @param mixed $sample
+     */
+    public function testSample($sample)
+    {
+        // Suppress output to console
+        $this->setOutputCallback(function () {
+        });
+
+        require $sample;
+    }
+
+    public function providerSample()
+    {
+        $skipped = [
+            'Chart/32_Chart_read_write_PDF.php', // Unfortunately JpGraph is not up to date for latest PHP and raise many warnings
+            'Chart/32_Chart_read_write_HTML.php', // idem
+        ];
+
+        // TCPDF does not support PHP 7.2
+        if (version_compare(PHP_VERSION, '7.2.0') >= 0) {
+            $skipped[] = 'Pdf/21_Pdf_TCPDF.php';
+        }
+
+        // Unfortunately some tests are too long be ran with code-coverage
+        // analysis on Travis, so we need to exclude them
+        global $argv;
+        if (in_array('--coverage-clover', $argv)) {
+            $tooLongToBeCovered = [
+                'Basic/06_Largescale.php',
+                'Basic/13_CalculationCyclicFormulae.php',
+            ];
+            $skipped = array_merge($skipped, $tooLongToBeCovered);
+        }
+
+        $helper = new Sample();
+        $result = [];
+        foreach ($helper->getSamples() as $samples) {
+            foreach ($samples as $sample) {
+                if (!in_array($sample, $skipped)) {
+                    $file = '../samples/' . $sample;
+                    $result[] = [$file];
+                }
+            }
+        }
+
+        return $result;
+    }
+}