Automatic Sphinx-builds with Travis-CI

Steps

Prepare Github Pages

Update the push.sh file to push the built Sphinx pages to gh-pages branch.
Initialize an empty gh-pages -branch (if does not exist already) with:
- git checkout --orphan gh-pages
  - if gh-pages branch exists activate it
- create .nojekyll file to ensure that GitHub pages are built correctly
  - $ touch .nojekyll
- commit and push to gh-pages branch on your repository

Set up Travis

Create Personall Access Token for your GitHub repository (needs to be done separately for each repository)
- Copy / Paste the token temporarily to somewhere (needed on the next step)
Create (locally) encrypted Travis Token for your repository using Ruby's travis -library
- You need to have Ruby installed on your computer + travis package (gem install travis)
- Generate token with travis library with command $ travis encrypt GH_TOKEN=[paste your token here]
Configure your travis build from .travis.yml file.
Activate the repository from Travis-CI settings
Once you have set up the .travis.yml and activated the repository, build the first version by triggering the build from Travis-CI dashboard