Config files for flexible/{mailgun,mailjet}.

Also, fix a tiny bug in FileUtil.php where occaisionally the { character
appears in file names.  It didn't cause anything to fail, but it's just
scary.

Author: SurferJeffAtGoogle

appengine/flexible/mailgun/README.md

@@ -0,0 +1,19 @@
+# Mailgun PHP Sample Application for App Engine Flexible Environment.
+
+## Description
+
+The sample code lives in [the standard directory](../../standard/mailgun).
+Only two configuration files differ: `app.yaml` and `nginx-app.conf`.
+
+Copy `app.yaml` and `nginx-app.conf` into [that directory](../../standard/mailgun),
+then follow the instructions in the [README](../../standard/mailgun/README.md).
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../../LICENSE)
+
+

appengine/flexible/mailgun/app.yaml

@@ -0,0 +1,5 @@
+runtime: php
+vm: true
+
+runtime_config:
+  document_root: .

appengine/flexible/mailgun/nginx-app.conf

@@ -0,0 +1,4 @@
+location / {
+  # try to serve file directly, fallback to front controller
+  try_files $uri /index.php$is_args$args;
+}

appengine/flexible/mailjet/README.md

@@ -0,0 +1,19 @@
+# Mailjet PHP Sample Application for App Engine Flexible Environment.
+
+## Description
+
+The sample code lives in [the standard directory](../../standard/mailjet).
+Only two configuration files differ: `app.yaml` and `nginx-app.conf`.
+
+Copy `app.yaml` and `nginx-app.conf` into [that directory](../../standard/mailjet),
+then follow the instructions in the [README](../../standard/mailjet/README.md).
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../../LICENSE)
+
+

appengine/flexible/mailjet/app.yaml

@@ -0,0 +1,5 @@
+runtime: php
+vm: true
+
+runtime_config:
+  document_root: .

appengine/flexible/mailjet/nginx-app.conf

@@ -0,0 +1,4 @@
+location / {
+  # try to serve file directly, fallback to front controller
+  try_files $uri /index.php$is_args$args;
+}

appengine/standard/mailgun/composer.json

@@ -2,9 +2,12 @@
     "require": {
         "silex/silex": "^1.3",
         "mailgun/mailgun-php": "~2.0",
-        "php-http/guzzle6-adapter": "^1.0"
+        "php-http/guzzle6-adapter": "^1.0",
+        "symfony/yaml": "^3.1"
     },
     "require-dev": {
-        "symfony/browser-kit": "^3.0"
+        "symfony/browser-kit": "^3.0",
+        "google/cloud-tools": "^0.3.0",
+        "paragonie/random_compat": "^2.0"
     }
 }