Add Travis CI support for this repository

[astorije]

Configuring a third-party service to display Jekyll build error messages

[xPaw]

Something like this should do:

language: ruby
rvm:
- 2.2

install:
- gem install jekyll html-proofer

script:
- jekyll build
- htmlproofer ./_site

# speeds up installation of html-proofer
env:
  global:
  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true

https://jekyllrb.com/docs/continuous-integration/

[astorije]

Good setup, @xPaw!
I'm thinking this would also help with #3 and could use something like #33 as well. And by the way, I would say that all are up for grabs 😉.

[astorije]

I'm actually doing this with Netlify now, which has a few cool things such as PR previews among other things.