Add trailing newline flag to beautify options

Just a boring commit to
1) update `package.json` and `Gruntfile.js` to have `grunt beautify` add newlines at the end of files
2) refactor all the files without a trailing newline
This should reference the aria templates repo and not your fork, something like:
```
"grunt-beautify": "git+https://github.com/ariatemplates/grunt-beautify.git#v0.1.1+at1"
```