CI / CD for demo installation

[jkrug]

Please add an Continous Integration and a Continious Deployment to a demo server so there is an automaticly updated Demo with the latest stable version.
Please include at least one shop solution (OXID, Shopware, Magento, Prestashop, ...) to test the FULL application and not only the displaying of stuff.

Depends on #158

[saimaz]

This issue confuses as with a checkout part. @jkrug how do you imagine which shop we should use for the example?

IMO there should be some minimal requirements:

1. Avoid to write module for it.
2. Avoid maintain the source code. We do not want to follow releases often and then try to adapt what was changed. etc

These are 2 my biggest concerns. IMO sphere.io might be a good choice as of light and quick example?

@jkrug what do you think?