html fixtures to use LF line endings

Unit testing across platforms has been difficult because of varying line endings (`\r\n` vs `\n`).

This pull request instructs git to normalize line endings in our html fixtures to **LF** `\n`. This makes testing across platforms easier.

based on: https://help.github.com/articles/dealing-with-line-endings

**Please Note**
if you are on windows, please run the following so that your repo contains the normalised html files.
You will loose changes if you haven't already committed them.

```
git rm -r --cached .

git reset --hard
```