Issue/327 versioning (#345)

* Switch to semver format

* Rewrite new version check to use Github Releases and cron

* Styling

* Remove v from in front of version

* New version check test fix

* Uncomment test case

app/Support/HttpClient.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Support;
+
+use GuzzleHttp\Client;
+
+/**
+ * Helper for HTTP stuff
+ */
+class HttpClient
+{
+    private $httpClient;
+
+    public function __construct(
+        Client $httpClient
+    ) {
+        $this->httpClient = $httpClient;
+    }
+
+    /**
+     * Download a URI. If a file is given, it will save the downloaded
+     * content into that file
+     *
+     * @param       $uri
+     * @param array $opts
+     *
+     * @throws \GuzzleHttp\Exception\GuzzleException
+     *
+     * @return string
+     */
+    public function get($uri, array $opts = [])
+    {
+        $opts = array_merge([
+            'connect_timeout' => 2, // wait two seconds by default
+        ], $opts);
+
+        $response = $this->httpClient->request('GET', $uri, $opts);
+
+        $body = $response->getBody()->getContents();
+        $content_type = $response->getHeaderLine('content-type');
+        if (strpos($content_type, 'application/json') !== false) {
+            $body = \GuzzleHttp\json_decode($body, true);
+        }
+
+        return $body;
+    }
+}