Fixed non-ASCII characters issue

I'm developing an AngularJS project using `gulp` with `gulp-ruby-sass` in order to compile all the `scss` files. Everything worked on my machine (I have a MackBook Air, but I'm developing using Vagrant VM with Ubuntu), but when I tried to deploy it on Heroku I got:

```
Error in plugin 'gulp-ruby-sass'
Message:
    error /tmp/build_abab9a195c7b2366a08c918fe16ba4d5/bower_components/neat/app/assets/stylesheets/grid/_row.scss (Line 1: Invalid US-ASCII character "\xE2")
```

Here is the full output: https://gist.github.com/willian/673ce685f5200a93ac2d

The problem is with some non-ASCII characters in some files. I'm creating this PR to fix those files by removing non-ASCII characters.

If you want to know how I found those characters, I open the files on my Vim and I executed `/[^\x00-\x7F]`

PS.: I'm sorry, I updated the version because I wasn't able to test only by pointing to a commit hash.