Added p.while API

src/globals.js

@@ -6,6 +6,29 @@
 
 global._ = require('lodash');
 global.p = require('bluebird');
+/**
+ * Add a while loop to the bluebird promises...
+ * @param condition function which returns truthy if the action should be called again.
+ * @param action   function to call as the loop implementation.
+ * @returns {*}
+ */
+p.while = function(condition, action) {
+  var resolver = p.defer();
+
+  var loop = function() {
+    if (!condition()) return resolver.resolve();
+    return p.cast(action())
+      .then(loop)
+      .catch(function(err) {
+        resolver.reject(err);
+      });
+  };
+
+  process.nextTick(loop);
+
+  return resolver.promise;
+};
+
 global.path = require('path');
 global.fs = require('./kernel/file-storage')();
 global.assert = require('assert-plus');