test/style: use nyc instead of istanbul, npm audit fix

Author: nknapp

.istanbul.yml

@@ -263,7 +263,7 @@ module.exports = function(grunt) {
 
   this.registerTask('amd', ['babel:amd', 'requirejs']);
 
-  this.registerTask('test', ['test:bin', 'test:cov', 'test:check-cov']);
+  this.registerTask('test', ['test:bin', 'test:cov']);
 
   grunt.registerTask('bench', ['metrics']);
 

Gruntfile.js

@@ -0,0 +1,9 @@
+module.exports = {
+  'check-coverage': true,
+  branches: 100,
+  lines: 100,
+  functions: 100,
+  statements: 100,
+  exclude: ['**/spec/**', '**/handlebars/compiler/parser.js'],
+  reporter: 'html'
+};