Feature checks detected within comments and strings

`customizr` (used via `gulp-modernizr`) detects feature checks within comments.
Is this the intended behavior? Thanks!

**Example 1**

```
//if (Modernizr.getusermedia){
//    ...
//}
```

=> `<html class="js getusermedia">`

**Example 2**

`console.log('Modernizr.audio');` => `<html class="js audio">`
