Add beta download channel and flat JSON-based version updater

version.beta.inc.php

@@ -0,0 +1,4 @@
+<?php
+//Edit this file on each new release
+$current_version = "1.0.4-b2";
+$current_version_download_link = "http://thinkupapp.com/downloads/beta/thinkup_1.0.4-b2.zip";

version.json

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+{"version":"1.0.3", "url":"https://github.com/downloads/ginatrapani/ThinkUp/thinkup_1.0.3.zip"}

version_beta.json

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+{"version":"1.0.4-beta.1", "url":"http://thinkupapp.com/downloads/beta/thinkup_1.0.4-beta.1.zip"}

version_download_beta.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * Return current version and download location in JSON format, with override for web updater tests.
+ */
+require_once('version.beta.inc.php');
+header('Content-type: application/json');
+
+// Test override
+if (isset($_GET['version']) && isset($_GET['url'])) {
+	$current_version = $_GET['version'];
+	$current_version_download_link = $_GET['url'];
+}
+?>
+{"version":"<?= $current_version ?>", "url":"<?= $current_version_download_link ?>"}