update testem version to fix  assertions
Sort dependencies using npm install --save
Merge pull request #717 from xtian/sort-deps

Sort dependencies using npm install --save
Merge pull request #714 from joesteele/update-testem

Update testem version to fix  assertions
Update CHANGELOG for #714.
bump v0.0.28 :tada:
Update CHANGELOG.md
Load vendor.css from index.html.
Merge pull request #728 from rjackson/load-vendor-css

Load vendor.css from index.html.
Allow testem port to be specified.
Merge pull request #729 from rjackson/pass-port-to-testem

Allow testem port to be specified.
Add `assets/vendor.css` to `tests/index.html`.