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travis-ci

added stdout/stderr output validation (#147)

Thanks to @gerdreiss for the following commits which were squashed:

- added tracking for symbol use
- adapted test case

* - using Set instead of List for used definitions

* - moved the usage state to class Definition
- moved the usage check to class Scope

* - converted Definition constructor param "used" to member variable
- added output verification to test case

* - print warning yellow and bold
- added output verification to test case

* - Stdout/stderr output validation

* - Stdout/stderr output validation

* - Stdout/stderr output validation including included and child scopes

12 of 12 new or added lines in 3 files covered. (100.0%)

807 of 1163 relevant lines covered (69.39%)

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