typo in Gruntfile cause *.spec.js changes trigger livereload

In Gruntfile.js livereload section,

```
livereload: {
  files: [
  ...
  '!{.tmp,<%%= yeoman.client %>}{app,components}/**/*.spec.js',
```

miss a slash, should be

```
 '!{.tmp,<%%= yeoman.client %>}/{app,components}/**/*.spec.js'
```
