Travis-CI testing

[paulvollmer]

Context:

Use scripts from the scripts directory to check the parts (fzp's, svg's)

Problem or Idea:

At the moment we have no testing/analysis of the parts. adding CI to test the quality of the parts can help the core contributors to review and check the PR.

Solution or Next step:

• create a list of scripts we can use for testing (we have a lot of python scripts at the scripts drectory)
• create a Makefile to trigger the tests (let's start at first with scripts that pass. scripts that fail can be added by separate PRs)
• create a travis config to run the tests

/cc @el-j

[KjellMorgenstern]

This is done in pull request #187