added grep for tests

services/docstore/Gruntfile.coffee

@@ -54,6 +54,7 @@ module.exports = (grunt) ->
 			unit:
 				options:
 					reporter: grunt.option('reporter') or 'spec'
+					grep: grunt.option("grep")
 				src: ["test/unit/js/**/*.js"]
 			acceptance:
 				options: