Bump Bootstrap version to 3.3.1
Merge pull request #231 from CFXd/bump-bootstrap-version-to-3.3.1

Bump Bootstrap version to 3.3.1
.tmp folder has precedence over app when serving

This way an app/index.html which could be an e.g. Liquid or a Nunjucks
template, therefore should not be served, won't be served if there's a
compiled .tmp/index.html, which will be served first.