* documentation and script updates trying to fix#1647
* preparations for refactoring target/bin/
* complete refactor for target/bin/
* changing script output slightly
* outsourcing functions in `bin-helper.sh`
* re-wrote linting to allow for proper shellcheck -x execution
* show explanation for shellcheck ignore
* adding some more information
* outsourced linting tests into its own file
* trigger rebuild
* added SCRIPT variable to setup.sh
* trigger rebuild again
* major test rewrite
* outsourced `hadolint` too
* rewrote some parts of the linting logic due to a logic bug
* adjusted TravisCI
* corrected .bats test line
* corrected logging in linting tests
* updated `hadolint`