This patch adds a RESTful HTTP interface to Asterisk.

The API itself is documented using Swagger, a lightweight mechanism for
documenting RESTful API's using JSON. This allows us to use swagger-ui
to provide executable documentation for the API, generate client
bindings in different languages, and generate a lot of the boilerplate
code for implementing the RESTful bindings. The API docs live in the
rest-api/ directory.

The RESTful bindings are generated from the Swagger API docs using a set
of Mustache templates.  The code generator is written in Python, and
uses Pystache. Pystache has no dependencies, and be installed easily
using pip. Code generation code lives in rest-api-templates/.

The generated code reduces a lot of boilerplate when it comes to
handling HTTP requests. It also helps us have greater consistency in the
REST API.

(closes issue ASTERISK-20891)
Review: https://reviewboard.asterisk.org/r/2376/

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@386232 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api-templates/rest_handler.mustache

@@ -0,0 +1,38 @@
+{{! -*- C -*-
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013, Digium, Inc.
+ *
+ * David M. Lee, II <dlee@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+}}
+{{!
+ * Recursive partial template to render a rest_handler. Used in
+ * res_stasis_http_resource.c.mustache.
+}}
+{{#children}}
+{{> rest_handler}}
+{{/children}}
+/*! \brief REST handler for {{path}} */
+static struct stasis_rest_handlers {{full_name}} = {
+	.path_segment = "{{name}}",
+{{#is_wildcard}}
+	.is_wildcard = 1,
+{{/is_wildcard}}
+	.callbacks = {
+{{#operations}}
+		[{{c_http_method}}] = stasis_http_{{c_nickname}}_cb,
+{{/operations}}
+	},
+	.num_children = {{num_children}},
+	.children = { {{#children}}&{{full_name}},{{/children}} }
+};