added mailgun module

sites/all/modules/contrib/mail/mailgun/mailgun.install

@@ -0,0 +1,34 @@
+<?php
+
+
+/**
+ * @file
+ * Install, update and uninstall functions for the Mailgun module.
+ */
+
+/**
+ * Implements hook_uninstall().
+ */
+function mailgun_uninstall() {
+  // Delete variables.
+  $variables = array('mailgun_api_key', 'mailgun_from_action', 'mailgun_from_name', 'mailgun_from_mail', 'mailgun_tracking', 'mailgun_tracking_clicks', 'mailgun_tracking_opens', 'mailgun_queue', 'mailgun_log', 'mailgun_format');
+  foreach ($variables as $variable) {
+    variable_del($variable);
+  }
+}
+
+/**
+ * Implements hook_enable().
+ */
+function mailgun_enable() {
+  mailsystem_set(array('mailgun_test' => 'MailgunMailSystem'));
+}
+
+/**
+ * Implements hook_disable().
+ */
+function mailgun_disable() {
+  // Tell Mail System to remove Mailgun and restore to defaults.
+  mailsystem_clear(array('mailgun_test' => 'MailgunMailSystem'));
+  watchdog('mailgun', 'Mailgun has been disabled.');
+}