Use New Relic revision as configuration (#186)

This allows you to override revision retrieval for custom builds. This
is useful for builds where the revision is not in the current
directory.

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Added grafana recipe.
 - Added yammer recipe, based on Slack recipe.
 - Added Google Hangouts Chat recipe, based on Slack recipe.
+- Added support for New Relic deployment revision as config.
 
 ### Fixed
 - Fixed telegram recipe (#170) and updated docs

recipe/newrelic.php

@@ -17,14 +17,18 @@
     return runLocally('git log -n 1 --format="%an: %s" | tr \'"\' "\'"');
 });
 
+set('newrelic_revision', function() {
+    return runLocally('git log -n 1 --format="%h"');
+});
+
 desc('Notifying New Relic of deployment');
 task('newrelic:notify', function () {
     $appId = get('newrelic_app_id');
     $apiKey = get('newrelic_api_key');
 
     $data = [
         'user' => get('user'),
-        'revision' => runLocally('git log -n 1 --format="%h"'),
+        'revision' => get('newrelic_revision'),
         'description' => get('newrelic_description'),
     ];