[internal] use file resources in test cases

Signed-off-by: Tobias Hammerschmidt
<tobias.hammerschmidt@inmindcomputing.com>
[internal] revert test cases changes and configure surefire plugin to
set working directory as expected by test cases

Signed-off-by: Tobias Hammerschmidt
<tobias.hammerschmidt@inmindcomputing.com>
Merge pull request #5 from in-mind-computing/maven

Updated tests in maven branch