add pickDeep utility function to pick nested properties from objects

common/script/libs/pickDeep.js

@@ -0,0 +1,13 @@
+// An utility to pick deep properties from an object.
+// Works like _.pick but supports nested props (ie pickDeep(obj, ['deep.property']))
+
+import _ from 'lodash';
+
+module.exports = function pickDeep (obj, properties) {
+  if (!_.isArray(properties)) throw new Error('"properties" must be an array');
+
+  let result = {};
+  _.each(properties, (prop) => _.set(result, prop, _.get(obj, prop)));
+
+  return result;
+};