allow mocha timeout to be specified on grunt command line

services/spelling/Gruntfile.coffee

@@ -32,6 +32,7 @@ module.exports = (grunt) ->
 				options:
 					reporter: grunt.option('reporter') or 'spec'
 					grep: grunt.option("grep")
+					timeout: grunt.option("timeout")
 				src: ["test/unit/js/**/*.js"]
 
 	grunt.loadNpmTasks 'grunt-contrib-coffee'