RAT-202: Make tests run from within IntelliJ

* Apart from loading the resources via Resources.java
  the assertions need to adapt flexibly in case the test
  runs from within IntelliJ
* Working directory differs from IDE thus 'apache-rat-core'
  needs to be added flexibly to expectations.
 


git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1681382 13f79535-47bb-0310-9956-ffa450edef68
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