Add Discord recipe (#177)

* Add psr-4 autoload

* Add default messaging

* Add Discord recipe

* Update docs

* Remove psr-4 autoloading

* Attach Discord Messaging class into Discord recipe

* Remove classes and namespaces

* Update readme

Author: lucasmezencio

docs/discord.md

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+# Discord recipe
+
+## Installing
+
+Require discord recipe in your `deploy.php` file:
+
+```php
+require 'recipe/discord.php';
+```
+
+Add hook on deploy:
+ 
+```php
+before('deploy', 'discord:notify');
+```
+
+## Configuration
+
+- `discord_channel` – Discord channel ID, **required** 
+- `discord_token` – Discord channel token, **required**
+
+- `discord_notify_text` – notification message template, markdown supported, default:
+  ```php
+  [
+      'text' => ':information_source: **{{user}}** is deploying branch `{{branch}}` to _{{target}}_',
+  ]
+  ```
+- `discord_success_text` – success template, default:
+  ```php
+  [
+      'text' => ':white_check_mark: Branch `{{branch}}` deployed to _{{target}}_ successfully',
+  ]
+  ```
+- `discord_failure_text` – failure template, default:
+  ```php
+  [
+      'text' => ':no_entry_sign: Branch `{{branch}}` has failed to deploy to _{{target}}_',
+  ]
+
+## Tasks
+
+- `discord:notify` – Notify Discord
+- `discord:notify:success` – Notify Discord about deploy finish
+- `discord:notify:failure` – Notify Discord about deploy failure
+- `discord:test` – Just notify your Discord channel with all messages, without deploying
+
+## Usage
+
+If you want to notify only about beginning of deployment add this line only:
+
+```php
+before('deploy', 'discord:notify');
+```
+
+If you want to notify about successful end of deployment add this too:
+
+```php
+after('success', 'discord:notify:success');
+```
+
+If you want to notify about failed deployment add this too:
+
+```php
+after('deploy:failed', 'discord:notify:failure');
+```

recipe/discord.php

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+<?php
+/* (c) Lucas Mezêncio <lucas.mezencio@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Deployer\Task\Context;
+use Deployer\Utility\Httpie;
+
+set('discord_webhook', function () {
+    return 'https://discordapp.com/api/webhooks/{{discord_channel}}/{{discord_token}}/slack';
+});
+
+// Deploy messages
+set('discord_notify_text', [
+    'text' => ':information_source: **{{user}}** is deploying branch `{{branch}}` to _{{target}}_',
+]);
+set('discord_success_text', [
+    'text' => ':white_check_mark: Branch `{{branch}}` deployed to _{{target}}_ successfully',
+]);
+set('discord_failure_text', [
+    'text' => ':no_entry_sign: Branch `{{branch}}` has failed to deploy to _{{target}}_',
+]);
+
+// Helpers
+set('send_message', function ($data) {
+    Httpie::post(get('discord_webhook'))->body($data)->send();
+});
+
+// Tasks
+desc('Just notify your Discord channel with all messages, without deploying');
+task('discord:test', function () {
+    $notify = get('discord_notify_text');
+    $success = get('discord_success_text');
+    $failure = get('discord_failure_text');
+
+    get('send_message')($notify);
+    get('send_message')($success);
+    get('send_message')($failure);
+})
+    ->once()
+    ->shallow();
+
+desc('Notify Discord');
+task('discord:notify', function () {
+    get('send_message')(get('discord_notify_text'));
+})
+    ->once()
+    ->shallow()
+    ->isPrivate();
+
+desc('Notify Discord about deploy finish');
+task('discord:notify:success', function () {
+    get('send_message')(get('discord_success_text'));
+})
+    ->once()
+    ->shallow()
+    ->isPrivate();
+
+desc('Notify Discord about deploy failure');
+task('discord:notify:failure', function () {
+    get('send_message')(get('discord_failure_text'));
+})
+    ->once()
+    ->shallow()
+    ->isPrivate();