Removed "return Singleton.get(warnings);" in
NewWarningDetectorTest.readWarning(.....) and adjusted the dependencies
Added getContextHashCodeSha() and setContextHashCodeSha()
Added getter and setter for contextHashCodeSha
Added "commons-collections4" to pom.xml
Added testFileWithManyWarningsHasSameHashcode()
Added files (java and xml) for showing that two java-files with >= 2
warnings have the same hashcode