keep _site in version control
keep _site in version control

dpl, travis' internal build tool, uses git to push commits to a branch
for github pages to track: https://github.com/travis-ci/dpl/blob/master/lib/dpl/provider/pages.rb#L171-L209

This means that if the output of the build is ignored, it will never get
to space today :(

newhavenio/newhavenio.github.io,newhavenio/newhavenio.github.io,newhavenio/newhavenio.github.io,newhavenio/newhavenio.github.io